H-BAU ISOMUR® Wall Foot Elements

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ISOMUR® wall base elementfor efficient insulation of the building foundation

ISOMUR® - on a secure footing

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H-Bau Technik GmbHContact

H-BauTechnik GmbH

Head Office:Am Güterbahnhof 2079771 KlettgauGermanyTel. +49 (0) 77 42 / 92 15-20Fax +49 (0) 77 42 / 92 15-90eMail: [email protected]

Paul Rieger:Tel. +49 (0) 77 42 / 92 15-21Fax +49 (0) 77 42 / 92 15-93Mobil +49 (0) 171 / 864 72 61eMail: [email protected]

Oliver EtzrodtTel. +49 (0) 70 82 / 41 39 63Fax +49 (0) 70 82 / 79 33 00Mobil +49 (0) 171 / 864 72 60eMail: [email protected]

Rudolf TillTel. +49 (0) 332 39 / 775-24Fax +49 (0) 332 39 / 775-90Mobil +49 (0) 172 / 993 70 50eMail: [email protected]

Production North-East:Brandenburger Allee14641 Nauen-WachowGermanyTel. +49 (0) 332 39 / 775-20Fax +49 (0) 332 39 / 775-90eMail: [email protected]

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3ISOMUR® - on a secure footing

Contents

ISOMUR® Wall base elements

Thermal insulation and moisture proofing 4-7

Energy saving – a health risk? 4

Efficient insulation of the building foundation 5

Comparison of insulation measures 6

Building material moisture content and thermal insulation 7

Fire protection and sound insulation 8

Fire protection 8

Sound insulation 8

Energy Saving Ordinance (EnEV) 8-9

Thermo-technical characteristic data 10

Static measurements 11

Wall base design 12

Installation instructions 13

References 14

Recommendations for tenders 15

ISOMUR®

Wall base elements

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Thermal insulation and moisture proofing

4

Energy saving – a health risk?

The better the thermal insulation of thebuilding shell is, the more delicate thethermal bridges.

Present day thermal insulation regu-lations such as the Energy Saving Or-dinance (EnEV) in the case of newbuildings with thermal insulation com-posite systems or double-leaf masonryresult in insulation thicknesses of 120

mm or more. External wall and roofconstructions are easily adapted.However, thermal bridges are alwaysmore problematic due to the ever-im-proving insulation of the buildingshell. This circumstance is confirmed by thefact that fungal attack is a topic to betreated seriously even in new build-ings and constructors and building

experts are confronted increasinglywith this set of problems. If, in addi-tion to the actual energy-saving meas-ures, no accompanying measures aretaken in regard to thermal bridges,the risk of fungal attack increases.As a result, the one-sided saving ofenergy can become a health risk.

Altenaria fungi Images of damage that are a thing of the past when Isomur plus is installed.

The building foundation is a central weak spot.

Non-insulated building foundation

Where there is no insulation of the building foundation, the rising masonrywork interrupts the thermal insulation shell of the building between the exteriorwall insulation and the thermal insulation over the basement floor.

This means:Increased risk of fungal attack from locally increased relative air humidity asa result of a lower surface temperature in the area of the wall base.

Thermal loss

Insulated building foundation

Isomur plus closes the gap in the thermal insulation between the exterior wallinsulation and the insulation over the basement floor.

This means:A healthy interior climate

The risk of fungal formation is mitigated

Minimum thermal loss

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Efficient insulation of the building foundation

The Isomur plus element is conceivedfor application in all residential build-ing masonry work and complies withmasonry strength class 20.

The use of Isomur plus mitigates therisk of moisture damage internallyin the form of discolouration andfungal formations.

The requirements on load-bearingcapacity and serviceability are en-tirely fulfilled under practical con-ditions.

Isomur plus solves the problem of thermalbridges on wall bases:

The element is non-absorptive and there-fore the thermal insulation is not impairedby the moisture arising during the con-struction phase.

The element has thermal insulation prop-erties which mitigate definitively the ther-mal bridges.

The installation of the element is simpleand problem-free and therefore the flaw-less quality is not dependent on awkwardon-site measures.

Walling up as the lowest layer in the masonry work

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Comparison of insulation measures

Building foundation with no special measures

For building foundations with no special measures the rising masonrywork interrupts the thermal insulation shell of the building between the ex-terior wall insulation and the insulation over the basement floor.Thus in connection with the high thermal conductivity of the building bricksin the vertical direction (λ ≈ 1.0 W/mK) a massive thermal bridge formson the building foundation.This means:

Decline in the internal surface temperature with the resulting risk ofdiscolouration, fungus formation and egress of condensation waterIncreased thermal loss resulting in increased heating costs

Constructional insulation measures

In order to mitigate the thermal bridges in the building foundation, the ex-terior wall insulation in the form of perimeter insulation is often continuedinto the ground. In addition to the not insignificant costs of this measure,the achievable insulation effect is therefore also limited.In particular, by pulling the perimeter insulation further down, no addi-tional increase in insulation effect is achieved from a depth of approx. 0.5m

Insulating with Isomur plus

The load-bearing thermal insulation element Isomur plus closes the gapin the thermal insulation between the exterior wall insulation and the in-sulation over the basement floor. This produces a continuous, highly effi-cient, thermal insulation.This means:

Increase of the interior surface temperature considerably above thecritical dew-point temperatureMitigation of the risk of fungal formation and egress of condensationwaterHealthy interior climateMinimised thermal loss and thus cost savings on heating

Theoretical ideally-insulated building foundation

In order to compare the thermal insulation effect of the constructions de-scribed above, the theoretical ideal case of a completely closed thermalinsulation layer is defined as a benchmark. However, for structural rea-sons this measure is not realisable in practice.

Building foundation with no special measures

Constructional insulation measures

Insulating with using Isomur plus

Theoretical ideally-insulated building foundation

Thermal insulation

effect 0%

+ 20°C

- 10°C

+10°C

Thermal insulation

effect ≤45%

Thermal insulation

effect 70%

Thermal insulation

effect 100%




Building material moisture content and thermal insulation

Thermal insulation effect and humidityThe thermal conductivity is a characteristic valueof the raw material which is influenced signifi-cantly by the moisture content of the buildingmaterial. The higher the absorptive capacity of abuilding material, the greater the negative influ-ence on the thermal insulation effect. Therefore,the selection of a building material to be used ina damp environment is of decisive importance.

Declared values and real conditionsIn the saturated condition absorptive buildingbricks have a considerably higher thermal con-ductivity than the λ values specified in the datasheets. The thermal conductivity increases by ap-prox. 0.28 W/mK for each 10% by volumemoisture content. Thus for aerated concrete forexample, the absorbable amount of water is upto 45% by volume. For an installation humidity of25% by volume, the thermal conductivity is there-fore approx. 0.9 W/mK. For a wall base, hu-midity can be assumed fundamentally, whetherit is in the form of standing water on the floor ofthe building shell or introduced with the floatingfloor screed, to name but two factors.

Time characteristic for building dry-outThe moisture absorbed by the wall base duringthe construction phase can only be releasedagain very slowly due to the all-round “packing”of the first layer of bricks. Using FEM simulation,the Fraunhofer Institut für Bauphysik [BuildingPhysics] determined that the actual thermal con-ductivity of absorptive bricks is significantlyhigher than the specified λ value not only duringthe construction phase but also during the total,multi-year drying-out period of a new building.

The solution: moisture-resistant building elementsIsomur plus elements exhibit such low water ab-sorption that when used as a first layer of bricksthey are effectively a barrier layer. Thus the ther-mal insulation is guaranteed from the start with-out the need for costly measures on-site.

Dependency of the thermal conductivity on the building material moi-sture content taking aerated concrete and Isomur plus as the exam-ple [7], [10]

Moisture content during the drying-out period taking absorbtive in-sulating bricks and Isomur plus as the example

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Fire protection and sound insulation

8

Fire protection

I somur plus is below the upper edge of the f loor screed

upper edge of f loor screed

Fire protection requirements

The fire protection requirements relating to building walls are determined by the respective Federal State Building Reg-ulations.The fire protection requirements relating to supporting walls of non-detached, residential, low-height buildings(i.e. the highest floor level is nowhere more than 7 m above ground level) are at least F30-B according to Model Build-ing Code. In a specific case the provisions in the applicable Federal State Building Regulations must be observed.

F30 or F90 fire protection rating for space enclosure

Fire-resistance ratings F30 and F90

When using Isomur plus the classification of space-en-closing and non-space-enclosing walls into the fire-resis-tance ratings F30 and F90 in accordance with DIN 4102,part 2 or part 4 remains in existence if the installation iscarried out as follows:

Install the element within the floor construction such thatthe upper edge of the element lies below the upper edgeof the floor screed.The designation of the masonry walls with Isomur plusis then F30-AB or F90-AB in accordance with DIN4102, part 2. [8] [9]

FirewallsAs a general rule Isomur plus may not be used in firewalls.Therefore, approval for an individual, specific case is re-quired.

Sound insulation

Installing Isomur plus does not affect the sound insulation properties of the wall.

Energy Saving Ordinance (EnEV)

The Energy Saving Ordinance has been in force since1.02.2002 and defines the mandatory energy standardsfor new buildings. The methods of calculation in accor-dance with EnEV take into account, for the first time nu-merically, the effect of thermal bridges when calculatingthe heat transfer loss. The effect of the thermal bridgesplays a big part in particular for buildings with high ther-mal standards.

Percentage shares of heat transfer loss of a low-energyhouse [5]

Thermal br idges

Exterior walls

lower bui lding complet ion

Roof areas

Windows

13 %

31 %

11 %32 %

13 %


Energy Saving Ordinance (EnEV)


The designer is offered three possibilities for quantitative determination of the effect of thermal bridges:

1. No proof of thermal bridges

The heat transfer coefficient is increased by ∆UWB = 0.10W/(m2K) for the total thermally-conductive surface area.

2. Thermal bridge proof in accordance with DIN 4108, Supplementary Sheet 2

For construction details corresponding to the design examples in accordance with DIN 4108, Supplementary Sheet 2,an increase in the heat transfer coefficient for the total thermally-conductive surface area by ∆UWB = 0.05W/(m2K)can be expected.

3. More precise proof of thermal bridges

For proof of thermal bridges in accordance with DIN 4108-6 in conjunction with DIN EN ISO 10211-1 and DIN ENISO 12211-2, the effective thermal bridge loss coefficients ψa can be taken into account.

1. No proof of thermal bridges2. Thermal bridge proof in accor-dance with DIN 4108, Supp. 3

3. More precise proof of thermalbridges

Description No proofMaterial and geometrical confor-mance with design examples

Thermal bridge details according tothermal bridge catalogue or calcula-

tion

Thermal bridge correction factor 0.10 0.05Not all-inclusive/ individual

thermal bridgesdetermined

Heat transfer lossHT (W/K)

Σ Fi Ui Ai + 0.10 Atotal Σ Fi Ui Ai + 0.05 Atotal Σ Fi Ui Ai + Σ Fi ψi li

Moisture proofingRisk of mould fungus from condensation water egress

Moisture proofing fulfilled in accordance with the standard

Precise analysis of the moisture-related quality

Calculation example for single-family dwelling [6]

Thermal bridge correction factor ∆UWB (W/m2K)resp. Ψa (W/mK)

0.10 0.05 - 0.01

Decline in the U-value ≥31% ≥15% ~ 0%

Surface temperature in the internalcorner of the exterior wall

No data – risk of fungal attack

No data – not critical according toDIN 4108 Suppl. Sheet 2

15.9°CMoisture proofing optimally solved

The calculated ψ values for conventional interior and exterior wall constructions are listed on page 10 of this brochure.Using these values the exact proof of the thermal bridges (variant 3) can be made.

Note on the thermal bridge loss coefficients ψa: According to EnEV the thermal lossesof the heat-exchanging external con-struction elements are determinedacross the external dimensions. Ho-wever, this results in, e.g. for externalcorners, the product of the heat-ex-

changing surface and its U-valuebeing too high, as this turns out to bemuch too high compared with the in-ternal, dimensions-related and actual,heat-exchanging surface and addi-tional consideration of the thermal

bridge. For this reason when deter-mining the ψa values negative num-bers can materialise which lead to areduction in the losses calculated all-inclusively over the external dimensi-ons.

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Thermo-technical characteristic data

10

The following thermal bridge loss coefficients, temperature factors and minimum surface temperatures result due to thethermo-technical characteristic values of Isomur plus and sand-lime masonry.

Isomur plus Type

Thermal conductivity(W/mK)4)

20-11.520-1520-17.520-2020-24

0.245

Thermal insulation composite systems

Insulation(cm)

Isomur plusType

Ψ a 1)(W/mK)

fRsi2)

—ϑmin

3)

(°C)

16141210

20-1520-17.520-2020-24

-0.01-0.01-0.01-0.03

0.8670.8600.8530.844

16.015.815.615.3

Double-leaf exterior wall

Insulation(cm)

Isomur plusType

Ψ a 1)(W/mK)

fRsi2)

—ϑmin

3)

(°C)

16141210

20-1520-17.520-2020-24

-0.02-0.03-0.03-0.04

0.8630.8460.8360.825

15.915.415.114.8

ϑa=-10°C ϑ i=+20°C

fRSiϑmin

ϑ i=+10°C

Isotherms for thermal insulation composite systems

fRSiϑmin

ϑa=-10°C ϑ i=+20°C

ϑ i=+10°C

Isotherms for double-leaf exterior wall

Interior wallIsomur plus

TypeΨ a 1)

(W/mK)fRsi

2)

—ϑmin

3)

(°C)

20-1520-17.520-2020-24

0.140.170.190.21

0.8570.8430.8340.827

18.618.418.318.3

1) externally-referenced thermal bridge loss coefficientΨ a for Rse = 0.04 and Rsi = 0.13 (m2K/W)

2) temperature factor fRSi=(ϑmin-ϑa)/(ϑi-ϑa) forRse = 0.04 and Rsi = 0.25 (m

2K/W)

3) minimum surface temperature ϑmin

4) rated value of the thermal conductivity according to approval, equi-valent λ value on the homogeneous body

ϑa=-10°C ϑ i=+20°C

fRSiϑmin

ϑ i=+10°C

Isotherms for interior wall above an unheated basement


Static measurements


Masonry strength class 20

Isomur plus elements

Perspective

Isomur plus

Type

ElementwidthB (mm)

ElementheightH (mm)

ElementlengthL (mm)

Load-bearingcapacitykN/m

Thermal con-ductivity 1)(W/mK)

20-11.520-1520-17.520-2020-2420-30*

115150175200240300

113 600correspon-ding to ap-

proval0.245

High-s trength, l ightweight concrete

Polystyrene rigid foam

1) Rated value of the thermal conductivity, equivalent λ value on the homogeneous body

The dimensioning of the masonry walls using Isomur plus is made in accordance with DIN 1053, part 1.The approval Z-17.1-811 lists all the provisions which deviate from the standard. They relate to:

Earth pressure

Isomur plus is used exclusively in walls with no permanent earth pressure load.

Spatial stiffness

For masonry walls with Isomur plus a calculated proof for multiple-level buildings with up to two full storeys and a com-plete attic floor can be dispensed with according to the prerequisites specified in DIN 1053, part 1, paragraph 6.4.

Zone 3 and 4 seismic areas

The proof of sufficient building stiffening comes from interior walls, as in the specified zones walls with Isomur plus arenot taken into account in the calculation.

Base values σo of the permissible compressive stress in accordance with the approval 2):

Isomur plus Type

Strength class of thesand-lime brick

Base values σo of the permissible compressive stress in N[mm2]Masonry with mortar in accordance with DIN 1053-1

Normal mortar of mortar group IIa

Normal mortar of mortar group III

Thin-bed mortar

20-11.520-1520-17.520-2020-24

12≥20

1.61.9

1.61.9

1.82.4

2) Masonry: sand-lime brick or concrete precision block in accordance with DIN 106, part 1;Solid brick in accordance with DIN 105, part 1 or 2 (perforation volume ≤ 15%)

* Type 20-30 with no approval

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Wall base construction

12

Thermal insulation composite system

Thermal insulation element on the floor Thermal insulation element under the floor

I somur plus

Isomur plus

Isomur plus

Isomur plus

Double-leaf masonry

Thermal insulation element on the floor Thermal insulation element under the floor


Installation instructions


Installation above the basement floor

Lay the Isomur plus full-surface as the first row of bricks in the layer of mortar with no butt joint mortar mix. The ele-ment position is shown by the labelling. The elements must be carefully aligned, in particular with regard to a level and horizontal bearing surface for con-crete precision block masonry.The Isomur plus elements should be bricked over as soon as stability is guaranteed by the hardened mortar. When thin-bed mortar is used for the concrete precision block masonry it must be spread such that a joint thicknessof at least 1 mm and a maximum of 3 mm results on the polystyrene rigid foam and any minus tolerances of the light-weight concrete support structure are compensated.

Installation below the basement floor

Lay the Isomur plus full-surface as the last row of bricks in the layer of mortar with no butt joint mortar mix. The ele-ment position is shown by the labelling.

General notes

Protect the polystyrene rigid foam from contact with solvents and excessive heat.Isomur plus can be trimmed using conventional building tools. The shortened length segments must be at least 20 cmlong. Shortened length segments must not be placed adjacent to each other. Isomur plus elements must not be laid above each other as walling.Slots and recesses that weaken the support cross sections are not permitted.

Elements but t jo inted wi th no but t jo int mortar mix

min. 20 cm

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References

14

[1] Federal Government: Ordinance on energy saving thermal insulation and energy saving systems engineering forbuildings (Energy Saving Ordinance – EnEV), Federal Law Gazette No. 59 of 21 November 2001, Bonn.

[2] DIN 4108, Supplementary sheet 2: Thermal insulation in building construction, Supplementary sheet 2, Thermalbridges – design and construction examples. Beuth Publishing.

[3] DIN EN ISO 10211 Thermal bridges in building construction – Heat flows and surface temperatures. Beuth Pu-blishing.

[4] DIN 1053-1 Masonry, Part 1: Design and construction. Beuth Publishing, Berlin.

[5] Gierga M., Kieker J.: “Exterior wall construction following the introduction of the Energy Saving Ordinance”, Ma-sonry, 4/2002

[6] Maas A., Höttges K., Kammer A. – University of Kassel, Dept. of Building Physics, 7/2002

[7] Martinelli R., Menti K.: “Wall base elements: Dry (wall-) bases for comfortable spaces”, TZ Bau + Architektur, Issue3, 2001

[8] Fire Protection Technical Test Certificate No. 3239/224 1a, IBMB – Institute for building materials, solid structu-res and fire protection, Technical University of Braunschweig

[9] Expert’s report No. 99078-Hn on fire protection of the wall base insulation elements “Isomur light”, Hahn Con-sult, Braunschweig, 2000

[10] Inspection report No. 13.17388 on the water absorption of Isomur elements, FMPA Baden Württemberg, Stutt-gart


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___________________________________________________________________________

Work section: Area of application: DIN 276012 Masonry Exterior and interior walls

__________________________________________________________________________________ISOMUR® Wall base elements

01 Wall base elements type Isomur plusload bearing, water impermeable, thermally insulating. As the first or last layer in the rising masonry. The element is comprised of a bearing structure made from high-strength, light-weight concrete and polystyrene rigid foam.General Technical Approval (DIBt, Berlin) [German Institute for Construction Technology] No. Z-17.1-811Rated value of the thermal conductivity: λ = 0.245 W/(mK)

02 Required for construction are:

03 ....... m Isomur plus type 20-11.5 (h/b/l) 113/115/600mm

04 ....... m Isomur plus type 20-15 (h/b/l) 113/150/600mm

05 ....... m Isomur plus type 20-17.5 (h/b/l) 113/175/600mm




09 delivery and installation10 installation is made in accordance with specifications from H-BAU Technik GmbH

Am Güterbahnhof 2079771 Klettgau-ErzingenTel.: 0 77 42 / 92 15-20Fax: 0 77 42 / 92 15-90www.h-bau.de

11 Material ....................12 Labour ....................13 Unit price ....................

14 Total price ....................

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H-BAU Technik GmbHAm Güterbahnhof 2079771 Klettgau-ErzingenGermanyTel. + 49 (0) 7742 92 15-20Fax + 49 (0) 7742 92 [email protected]

Production North EastBrandenburger Allee 3014641 Nauen-WachowGermanyTel. + 49 (0) 3 3239 775-20Fax + 49 (0) 3 3239 [email protected]

80mm Balcony insulation elements

120mm Balcony insulation elements

Transport anchors

Shuttering tubes

Shear dowels

Reinforcement connectors

Reinforcement connectors

Masonry fixings

Sealing technology

Sealing technology

Rustproof stainless steel

Shuttering elements

Shuttering elements

Shuttering elements

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Spacers

03/2

011

H-BAU ISOMUR® Wall Foot Elements

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