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How to bend ridge caps in cold climate?
Horizontal and vertical overlaps of AB Thermo AD membrane:
The adhesion of the underlayment will start partly by the sun, but later-on during the installation of shingles by torch the adhesion will become adequately enough. Horizontal overlaps on Armourbase Thermo AD membrane are 10 cm, but end laps must be 15 cm. When the selvedge foil on top of membrane is removed, all overlaps must be pressed with a suitable roller.
Application of shingles on top of the membrane:
All types of IKO shingles can be used and combined with this method. Start with the precutting of shingles for diagonal application and prepare the starter strip as well. It always helps if you prepare a few shingles before. Get the torch with propane ready and follow all safety rules and regulations when working with an open flame. Very important is to flame only the membrane and not the surface of shingles.
Shingles have to be laid to the melted layer of modified bitumen when the polypropylene mat fabric disappears after torching. The core of the membrane contains polyester which means the underlayment is very durable. At the same time the underlayment is also very flexible because of the modified polymers in the bitumen. Wind-seal dots or self-adhesive parts on shingles will be activated and sealed by the heat of the sun.
Remember: do not make joints and connections between the shingles close to the valley or to any details where a lot of water accumulates! When the shingles are not glued properly on the surface of Armourbase Thermo AD, you can always lift this shingle and flame the membrane again. The membrane is 2,5 mm thick and the head-lap of the shingles will then stick adequately.
Some installation tips for low slope and curved dormers:
- Always use a self-adhesive Armourbase Stick or Armourbase Pro Plus underlayment for parts with slopes from 9,5° to 20°
- For the vertical dormer wall it is very handy to use these underlayments as well
- Use only the necessary amount of nails to fix an underlayment on flatter parts of dormers
- For slopes between 4° - 9,5° use Armourbase Thermo AD and install shingles without the nails
- With every valley on the dormer or slope inclination where Closed-Cut method should be applied, follow the rule of overlapping the shingles from the lower slope to the higher slope
- With IKO Thermo System and torch-on installation apply shingles up to 15° maximum, because from 15° you can use the standard nailing method
- Don’t forget to use Shingle Stick for all roof details, roof penetrations and especially for metal flashings
