Product Guide for Roof Underlay

Roofing underlay is a jungle, and the choices you face when selecting one of the many methods for your outer roof are numerous. Therefore, we have compiled an easy-to-use guide for choosing roofing underlay, where you can see which options are suitable for different surfaces and constructions. You can also download the guide as a PDF here.

Note! Some of the products in the guide are undergoing name changes.

Accessories

Primer K-80

UNDERCOAT

Sealant K-36

GLUING AND SEALING

T-Fix

GLUING, SEALING, JOINTING

T-Roof Multi Strip

STRIP FOR BASE PLATE, VALLEY GUTTER, RIDGE AND JOINT

Roofseal-T / Corner

SEALING

Intended
use:

Primer, adhesion enhancer for surfaces such as concrete, brick, and roofing felt. Use if necessary before applying Sealant Adhesive.

For gluing and sealing of underlay felt and
underlay fabric. Sealing and repair of joints and penetrations on the outer roof and penetrations on the outer roof.

For bonding and sealing of underlay felt and underlay fabric. Sealing and repair of joints and penetrations on the roof.

Condensation and moisture protection for all roofs under the base plate, in the valley, ridge, and joint strip between roof cassettes.

Repair tape for minor damages
and sealing tape as well as corner sealing sheets at detail connections (e.g., corners, etc.) on underlay paper / underlay fabric.

Features:

Thin liquid black bitumen emulsion. Drying time approximately 2-3 hours (+20°C).

Black elastic bitumen paste. Dust dry in about 5 hours (+20°C). Drying time approximately 1-14 days depending on temperature.

Plastic and permanently elastic black sealant made of hybrid polymer.

Fully adhered self-adhesive black
underlayment of bitumen.

Stretchable single-sided tape
with butyl adhesive and UV-protected
aluminum foil.

Application:

With a semi-soft brush or roller.

Caulking gun or putty. Priming
if needed with primer K-80.

With a caulking gun. Pre-coating
if needed with primer.

With a firm handshake.

With firm hand pressure or roller.
On underlay paper (sanded)
pre-treatment with Primer K-80.

Consumption:

0.5-0.6 liters/m² coating.

Cross joint: 0.1 liters/joint. Valley: 0.2 liters/meter. Chimney base:
0.3 liters/chimney.

Cross joint: 0.1 liters/joint. Valley: 0.2 liters/meter. Chimney base: 0.5-1 liter/chimney. When sealing: As needed.

1 m per 1 m base plate, valley, ridge or joint.

For minor damages: Damage size +40 mm all around. For corners: 1 sheet per corner. 1 m per 1 m joint.

T-Butyl

SEALING AND JOINT

T-Flex Outdoor

SEALING

T-Sleeve Butyl

SEALING

Sealing Tape

SEALING

Distance

DISTANCE

Intended use:

Joint and sealing tape for suspended underlay roofs like X-Foil and T-Diff.

Repair tape for minor damages
(<100 mm) on suspended sub-ceiling like X-Foil and T-Diff.

For sealing round penetrations in underlay felt, underlay fabric
or suspended underlay roof.

Sealing tape for hanging
underlay roof between nail battens
(counter battens) and the membrane.

For securing suspended sub-ceilings that ensure
a drape of the fabric between the rafters.

Features:

Double-sided tape in gray
permanent elastic butyl mass.

Diffusion-tight, single-sided adhesive, and UV-protected aging-resistant black tape.

UV-protected aluminum foil with
butyl adhesive and sheath of elastic EPDM rubber.

Soft single-sided green foam tape.

Rigid foam profile.

Application:

The splice tape is attached to one of
the base with the protective strip on
opposite side intact. Assembly
should be done with full pressure on the seam.

With firm hand pressure or roller.

With firm hand pressure or roller. On
underlay felt (sanded) pre-treatment with Primer K-80.

With a firm handshake.

By hand.

Consumption:

1 m per 1 m joint.

Damage size + 40 mm all around.

1 mare per execution.

1 m per 1 m battens.

2 pcs per m² roof.

Ceiling Vent

VENTILATION

Intended use:

To ventilate an air gap or
cold attic (can replace tight ridge and/or eaves) when the outer covering
has underlay felt or underlay fabric on solid wood substrate with battens over.

Features:

Homogeneous UV-protected black
polypropylene (PP).

Application:

With 5 mounting screws per valve.

Consumption:

If needed, 1-2 pieces per truss bay at
ridge or alternatively eaves.