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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
Resume on dormers
Many people invest in dormer roofs as they can transform dark, stuffy loft spaces into bright and spacious living areas. Although dormer roofs require major alterations to a roof structure, the payoff is definitely worth the effort.
And your complete roof is covered with 1 single esthetical solution: You can choose any favorite shingle from the complete professional IKO Shingles range.
Interested in the product mentioned in this blogpost?
A stable and smooth roof deck is crucial for obtaining a solid roof. Concrete roof with shingles is a great solution for a solid roof. The most popular material used on the European market for roof structures is wood. A full deck for shingles is often built from OSB, plywood or wooden planks, followed by an underlayment and bitumen roof shingles that are nailed with roofing nails into that deck.
But in some other parts of the world, such as Southern Europe, Africa, Middle East or Southeast Asia, the roof structures and decks are made from solid concrete (as lumber is not always available) People in these areas built solid houses and roofs to protect themselves against bad weather, strong winds and heat. Using concrete provides them certainty in these circumstances.
To install a concrete roof bitumen shingles, a crew first builds a framework for the intended roof. These frames can either be removable concrete forms or stay-in-place insulating concrete forms, which simply become a part of the finished roof. Then a concrete mixture is poured, spread through the framework and reinforced with steel bars, which serve as a kind of skeleton for the cured concrete. While flat roofs are the easiest to create out of concrete, more complex sloped roofs are also possible. These options allow concrete roofs to match virtually any desired housing style, though sloped roofs require engineering and design.
Roofers can cover the roof with any type of roofing material to help give it the desired look. Of course a concrete roof requires more support than a typical wooden roof. It weighs a lot more than wood, so the outside walls have to be capable of supporting the giant concrete slab. Interior support beams can help, but the construction works best when the concrete walls, floor and roof form a solid shell. If a concrete roof isn't properly supported, it can collapse, especially if it is subjected to additional stresses such as earthquakes.
Concrete roof with bitumen shingles
As from spring 2021, IKO will offer 2 solutions on how to apply asphalt shingles on concrete roof decks. Fixing the shingles with special concrete nails is a first solution for slopes > 15°. For slopes > 4° -15°, shingles cannot be fixed mechanically. IKO Shingles can be flamed on Armourbase Thermo AD, a new underlayment in the IKO product portfolio providing a waterproofing layer and a perfect upper face to stick/flame shingles upon.
