Application Guidline

Content

Page

1. Preliminary notes 03

1.1 Legal Bases 03

2. Substrate 04

2.1 Assessment and preparation of the substrate 04

3. HECK insulation systems at wall bases 05

3.1 Preparations – Installing wall base profiles 06

4. Adhesive bonding 07

5. Anchors 08

5.1 Anchors types 08

5.2 Mechanical fastening of HECK insulation systems 08

5.2.1 HECK MultiTherm EPS 08

5.2.2 HECK MultiTherm MW 08

5.2.3 HECK MultiTherm L-MW 09

5.3 Anchor quantity for structural mechanical fastening 09

5.4 Anchor placement and quantities 10

6. Joint sealing – Installation of accessories parts 10

7. Reinforcement of window/door jambs 11

7.1 Surface reinforcement 12

8. Final coating and surface design 14

8.1 Finishing coats, thin-layered

2

3

1. Preliminary notes

Exterior thermal insulation using Exterior Insulation Finishing Systems reduces heating expenses, is environmentally sound

and improves interior climate and living comfort. EIF systems have proven reliable and effective for more than fifty years.

To ensure the durable functionality of an insulated facade, the installation of Exterior Insulation Finishing Systems must be

planned professionally and executed with attention to detail.

This installation guide will become invalid with the publication of a new edition. With the information contained herein we

want to advice to the best of our knowledge. The notes on installation are for informational purposes only; they have to be

adjusted to actual on-site conditions.

For HECK customers: prior to planning or installing our EIF systems, a briefing on our product systems is necessary. Please

contact us for details.

1.1. Legal Bases

The usage and application of EIFS are subject to building regulations and building codes. Those may be of European Union

origin, national origin or regional or local origin and may vary. Please make sure that application and usage of an EIFS at

your specific project comply with the current regulations and codes in place and also the guidelines of the producer, which

are completely binding. In principle the applicable legal bases require application and usage of systems. Mixing and

matching of system components normally does not comply with the legal bases.

Approvals for EIFS

Within the European origin EIFS may be used only, if the general fitness for use is confirmed by an European Technical

Approval (ETA). In some countries within the EU further more specific aspects are subject to national approvals or national

application documents. Outside of the European Union depending on the country the general fitness for use may be confir-

med by a national approval.

Any of those approvals or application documents may define requirements on application that needs to be obeyed.

Specific regulations for EIFS

Beside requirements defined in approvals or application documents specific national or even regional or local regulations

exist.

Typically fire protection requirements are nationally or regionally defined. In principle mineralwool based systems provide

the best fire protection. Foam based systems typically require additional measures to improve fire protection. A well recei-

ved and accepted method is to apply a at least 200 mm firebreak from non combustible mineralwool in the thickness of

the requested insulation at every second floor level and it is recommended to use this method if no other regulation on fire

protection exist nationally regionally or locally.

As energy efficiency and CO2-reduction are important topics in most countries regulations on design of structures or

building with regards to energetic performance are in place. Those national regulations may be complemented by regional

or local regulations or incentives. It is recommended to carefully design the system and its application to the energetic

performance regulations in place.

Further national, regional or local regulations may be valid during design and application of an EIFS with regards to sound

protection, impact resistance, environmental protection, requirements on static load accommodation and maybe other is-

sues. Those regulations and requirements may change the usage or application of an EIFS as described in this application

reference guide.

4

Substrate Treatment

moisture within masonry remove cause; vertical waterproofing, horizontal waterproofing, wait until substrate has dried

salt efflorescences sweep off, brush off, renew damaged render surfaces

discontinuities, expose hollow areas and fill cavities in plasterwork

brittle, nonstructurally-sound remove affected render and refill; plasterwork alternatively, use mechanical fixing

dusty, soiled sweep off, brush off, pressure-clean

algae, fungi, moss remove, post-treat mortar ridges remove

adhesion-inhibiting residues, steam-jet clean using additional detergent; such as formwork oil remnants wash off with water afterwards

chalking or sanding plasterwork clean and prime using stabilising primer

chalking paint coat brush off, clean and prime using stabilising primer

chipping paint coat remove; alternatively, use mechanical fixing for EIFS

highly absorbent, clean and prime non-alkali-resistant

unevennesses level with render (CS II / CS III / MG P II; curing time 1 day/mm minimum)

unknown substrates test adhesive properties and structural soundness; prime if necessary

2.1. Assessment and preparation of the substrate2. Substrate

5

3. HECK insulation systems at wall bases

Wall base flush with wall Setback wall base

1 wall construction material 2 building insulation in accordance with DIN 18195 (during construction) 3 HECK adhesive 4 HECK insulation board 5 HECK base coat 6 HECK finishing coat 7 Rajasil 2K DB or Rajasil DS FLEX 8 HECK EPS perimeter board 30-035, bevelled on-site 9 HECK system anchors; exact type depending on application10 HECK finishing coat for use on wall bases, e.g. HECK K+A; smooth-finished with felt or sponge float11 Rajasil SHF, two-coat application 12 Rajasil DS FLEX or, alternatively, Rajasil 2K DB for waterproofing the render system13 protective layer in accordance with DIN 18 145, e.g. dimpled sheet

1 wall construction material 2 building insulation in accordance with DIN 18195 (during construction) 3 HECK hammer-in anchor 4 HECK wall base profil 5 HECK adhesive 6 HECK insulation board 7 HECK base coat 8 HECK finishing coat 9 HECK Fugendichtband 2D (sealing tape)10 Rajasil 2K DB or Rajasil DD FLEX11 HECK EPS perimeter board 30-035 12 HECK system anchors; exact type depending on application13 HECK base coat (suitable for wall bases)14 finishing coat for use on wall bases, e.g. HECK K+A; smooth-finished with felt or sponge float15 Rajasil SHF, two-coat application16 Rajasil DS FLEX or, alternatively, Rajasil 2K DB for waterproofing the render system17 protective layer in accordance with DIN 18 145, e.g. dimpled sheet18 certified perimeter insulation board (during construction)

6

• installusingapprox.3HECK

hammer-in anchors/m

• levelunevennesseswithHECK

distance pieces

• createtransitionsusingHECK

wall base profile connector

• payattentiontoexpansion-joint

gap between profiles

• mitrecorners

Execution with wall base profile (recommended when wall bases ARE NOT insulated):

HECK special wall base solution (recommended when wall bases ARE insulated)

Tip:

Designs with mounted drip-edge

profiles are virtually free of thermal

bridges.

HECK wall base solution W 65

HECK mounting angle Z 16

HECK corner connection Z 15

insulation material

thickness ______ mm

HECK wall base profile Alu

HECK wall base profile V2A

HECK wall base profile

connector

HECK hammer-in anchors

HECK distance pieces

3.1. Preparations – Installing wall base profiles

7

4. Adhesive bonding

Ribbon-and-dab method; effective

adhesive bonding surface > 40%

Manual adhesive application

to entire surface

Partial-area bonding (effective

adhesive bonding surface > 60%;

application possible with EPS here)

Coverage:

•ribbon-and-dabmethod:approx.4kg/m²

•adhesiveapplicationtoentiresurface:

approx. 8 kg/m²

•partial-areabonding:approx.6kg/m²

minimum thickness 1.0 cm

Interlock corner boards for more stable compound.

With normal-sized window jambs the facade boards will extent into the opening,

so that the insulation material strip for the window jamb can installed without

creating thermal bridges.

Notch insulation boards at the corner of window openings.

8

5.1. Anchors types5. Anchors

Constructural anchors Load bearing anchors

hammer set anchors HECK SDK-FV HECK SD-FV

HECK NTK-U

anchors HECK SX-FV S HECK SX-FV U

anchors with screw HECK STR-H HECK STR-U

HECK hammer-in set anchors NTK-U HECK screw-in anchors STR-U

For notes on

anchor place-

ment, please

refer to our

Installation

Guidelines.

structurally sound substrate with or without

equalising render layer

5.2. Mechanical fastening of HECK insulation systems5.2.1. HECK MultiTherm EPS

non-structurally-sound

substrate

(unevennesses < 2 cm)

substrates without

existing render or paint

coat layer

(unevennesses < 1 cm)

existing structurally sound render

layer without paint coating

(unevennesses < 1 cm)

no mechanical

fastening up to the

application limit

wooden boards or

similar

recommendation:

structural mechanical fastening;

at least 4 – 6 pcs/m2 on the insulation boards

(in all T-joints)

load bearing anchors

with certified anchors according

to table (see 5.3.)

all substrates (unevennesses < 2 cm)

load bearing anchors with certified anchors

according to table (see 5.3.)

HECK MW 040 (Type HD) and HECK MW 035 (Type WV) with HECK anchor plate 90.

5.2.2. HECK MultiTherm MW

9

5.2.3. HECK MultiTherm L-MW

structurally sound substrate with or without

equalising render layer

non-structurally-sound

substrate

(unevennesses < 2 cm)

substrates without

existing render or paint

coat layer

(unevennesses < 1 cm)

existing structurally sound render

layer without paint coating

(unevennesses < 1 cm)

no mechanical

fastening with building

heights of up to 20 m

above 20 m, up to

100 m: mechanical

fastening with certified

anchors alongside edges

wooden boards or

similar

recommendation:

structural mechanical fastening;

at least 4 – 6 pcs/m2 on the insulation boards*

load bearing anchors

with certified anchors according

to table (see 5.3.)

* HECK MW Lamelle 040 (Type HD) with anchor plate 140.

5.3. Anchor quantity for structural mechanical fastening

The following table lists our recommendations for statically relevant mechanical fixing. However, national/regional regulation

must be adhered to at all time.

For higher buildings or higher wind loads please seek professional advice.

Height of building above ground level [m] up to 25 mup to 18 mup to 10 m

Wind zone and location Wind suction and anchor quantity per m2

0.738

6

0.959

8

1.18

8

1.106

8

1.328

10

1.623

12

0.959

8

1.18

8

1.328

10

very low

wind load

low

wind load

medium

wind load

constructional anchors 4 – 64 – 64 – 6

wind load [kN/m2]

anchors

wind load [kN/m2]

anchors

wind load [kN/m2]

anchors

load bearing anchors

10

1. EPS and MW boards, 4, 6, 8,10 and 12 anchors/m2, respectively

2. MW-Lamelle: 4 anchors/m2 on the surface, 8 anchors/m2 along the edge of the board

1

2

dR

a

5.4 Anchor placement and quantities

6. Joint sealing – Installation of accessories parts

Apu beads:

HECK corner beads with mesh

for THIN-LAYER systemsCorner beads:

HECK edge profile PVC with mesh reinforce all corners additionally

4 anchors 6 anchors 8 anchors 10 anchors 12 anchors

for THIN-LAYER systemsWindow/door jamb details:

joint sealing tape + pointing / elastic joint tape joint sealing tape + Apu bead

Seal the system properly to all adjoining structures

11

For jamb reinforcement, HECK edge profile PVC with mesh is recommended. You

can proceed like this: Start with the lintel angle bead. Make a 10 cm incision on both

the left and right end of the bead and remove the corner reinforcement there (1).

The angle beads at the vertical jambs are butt-jointed to the inner corner. There will

then be the required overlap at the junction/intersection with the window lintel.

HECK mesh (mesh sheet) is then butt-jointed to the window jamb edges. If possible,

avoid overlaps at corners, because this may lead to a (potentially visible) increase in

thickness of the render layer (3).

Then, apply diagonal mesh strips (20x30 cm) to all corners.

With this, make sure the first thread of the diagonal mesh runs through the corner

(4). The diagonal strip may also be installed together with the mesh sheet (after

completion of the work step shown in fig. 3).

In this case, the mesh strip is embedded directly on the mesh sheet and then thinly

covered with the second compound layer.

7. Reinforcement of window/door jambs

Window sill and jambs Building expanding joints have to be build into the system

12

Work steps 1 and 2 can be executed in a simplified manner, if a pre-made lintel

corner bead is used. The HECK edge profile to be installed horizontally and verti-

cally are to be jointed with a 10 cm overlap.

7.1. Surface reinforcement

In general, make sure there is sufficient overlap (10 cm

minimum) of HECK mesh at joints and connections. The

mesh has to be embedded into the upper third of the base

coat at all times. Depending on requirements as to impact

resistance and sonic properties of the EIFS, thin-layer or

thick-layer execution of the base coat is possible.

Fig. 1

Thick-layer reinforcement

Apply the first layer of HECK K+A (base coat mortar) in

approx. 4 mm layer thickness onto the insulation boards.

Then, embed HECK mesh into fresh mortar and apply a

second layer of HECK K+A (thickness approx. 3 mm) fresh-

in-fresh. Thick-layer base coat is required when thick-layer

finishing coats are to be applied, e.g. HECK Edelputz WD

(HECK EP WD) or Kratzputz (scraped finish); it may also be

necessary when there are increased demands in terms of

noise insulation or resistance to algae infestation.

Fig. 3

Thin-layer reinforcement (figs. 1 + 2)

HECK K+A base coat mortar is to be applied immediate-

ly in the final layer thickness of e.g. 4 to 6 cm (approved

thicknesses according to Technical Data Sheet). If HECK

K+A ZF is used, the layer thickness is approx. 3 mm. Then,

embed HECK mesh while mortar/reinforcement compound

is still fresh. The mesh has to be completely covered with

the compound; if necessary, trowel on another 1 to 2 mm

layer as shown in fig. 3. The application of another layer of

the compound is also necessary in cases where the diagonal

reinforcement is placed on the mesh sheet. Fig. 2

13

If the application of a thick-layer finishing coat, e.g. HECK

Edelputz WD (HECK EP WD) or Kratzputz (scraped finish) is

planned, horizontally key the fresh base coat in a wave-like

pattern using a road sweeper without exposing the mesh.

Keying should be done when the sinter skin (shiny layer)

forming on the compound is being opened/broken.

Fig. 5

Fig. 6

If the base coat work has to be interrupted, create a

“contact surface” by forcefully trowelling up the fresh

reinforcement mortar atop the mesh in a 10+ cm wide strip

at the fringe. On recommencing work, the required overlap

can then be created here, without generating uneven-

nesses, using reinforcement mortar and mesh.

Coverage:

approx 1.2 kg dry mortar/m² per 1 mm of layer

thickness

Coverage:

approx. 1.2 m²/m² HECK mesh

For the application of thin-layer finishing coats, e.g. HECK

Strukturputz (HECK STR) types KC or R), trowel up the

surface of the reinforcement layer evenly

(fig. 4).

With finishing coats of a very fine-grained texture especially,

it is recommended to smooth trowel tracks after the mortar

has set.

Fig. 4

14

8. Final coating and surface design

A large number of coatings can be used on HECK insulation systems, providing virtually limitless possibilities for the plan-

ning and designing of facades. Apart from numerous finishing coats with mineral or organic binders, HECK also provides

facade profiles for the aesthetic enhancement of facades. Through the use of brick slips it is also possible to create a facing

brick facade design.

thin-layer final coatings thick-layer final coatings

mineral textured renders (thin-layered) mineral textured renders (thick-layered)

silicate renders ceramic claddings

silicon resin renders

synthetic resin renders

coloured renders

facade profiles

As a matter of principle, render works may not be conducted if wall surface or air temperatures are below +5 °C. After ap-

plication, wall surfaces and ambient air must be frost-free for at least 48 hours.

The luminosity of finishing coats on EIF systems must not fall below the value of 20 (100 = white; 0 = black). Exceptions are

possible in individual cases, depending on situation of the object, its surface structure, surface design and surface area, as

well as render texture and binding agents. Please request professional advice.

8.1. Finishing coats, thin-layeredLime-cement finishing coats

– HECK Strukturputz (HECK STR), scraped finish and float finish variants

– HECK Edel-Dekor (HECK ED) (scraped finish and float finish variants)

– HECK ED WP (HECK ED WP), felt board/sponge board finished as well as textured; for whole-area application as

well as for decorative framings of window jambs, etc.

– HECK K+A (felt board/sponge board finished, at wall bases, and for smaller surfaces such as window jambs)

Silicate renders

– HECK Silikatputz (HECK SIP), scraped finish and float finish variants

Silicon resin renders

– HECK Siliconharzputz (HECK SHP), scraped finish and float finish variants; finishing coat for HECK EPS-EIFS

Synthetic resin renders

– HECK Kunstharzputz (HECK KHP), scraped finish and float finish variants; finishing coat for HECK EPS-EIFS

The method for texturing of the finishing coat, using e.g. a plastic trowel or a

sponge rubber float, depends on the render type.

In order to prevent differences in texture and colour, always work with the

movement of the sun and ensure that a sufficient number of applicators is

working at the same time.

With coloured mineral- or silicate-based finishing coats, a heterogeneous

colour effect is possible, depending on weather conditions and application

method. This is not a deficiency of the product. The facade can be given

a homogeneous appearance by coating it with an equalising paint coat

(e.g. Rajasil SHF) after the finishing coat has hardened.

Depending on where the building is situated, e.g. in wet lowlands, infesta-

tions with micro-organisms such as algae can occur. Please request prior

professional advice on suitable measures, such as algaecidal and fungicidal

protective coatings.

Due to the usage of mineral raw materials, follow-up deliveries may vary in

colour shade. In order to avoid follow-up shipments, make sure to order suffi-

cient quantities of the material.

Allow for sufficient drying time prior to the application of additional coatings/

renders.

Depending on the substrate and the finishing coat to be applied, roller-appli-

cation of HECK UG onto the dried base coat may be necessary. Please refer

to the Technical Data Sheets of the products in question. For float finish ren-

ders we always recommend applying a primer with a colour tone identical to

that of the finishing coat to prevent shining through of the reinforcement layer.

Allow at least one day of drying-time for the primer; then, using a stainless-

steel trowel, apply the finishing coat and trowel up in grain-size layer thick-

ness.

Coverage:

ca. 0.2-0.3 l/m²

15

03/2014

a company

HECK

RajasilMasonry restoration - sealing and injection, brick linings, jointings,renovation render systems

Stonework restoration, internal coating, lime renders, ecologicallysound systems

Facade coating - substrate preparation, renders and mortars, renderreinforcement, coating, waterproofing

Exterior Insulation Finishing Systems - mineral, synthetic resin bonded

Interior insulation systems - interior insulation board,

insulation render

Insulation render systems, primers, decorative renders, coatings

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Intelligent solutionsfor the building practice

HECK Wall SystemsGmbH & Co. KG

Thölauer Straße 2595615 Marktredwitz Germany

phone: +49 9231 802-0fax: +49 9231 802-330

www.wall-systems.com