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3. Iron content
A third but equally important characteristic is the degree of iron content found in stone. To be suitable a stone should have only a small amount of iron in its composition. This to prevent iron from leaking out from granules, which can lead to rust stains on a roof.
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Hips and ridges on a wooden deck
With hip and ridges, the underlayment is already covered with shingles. Therefore hips and ridges are installed by gluing the parts. For the hip or ridge, the Armourvent Multi ventilation can be applied from a 4° slope.
Armourvent Multi must be glued on both sides with the IKO Shingle Stick and then nailed to the wooden deck. Hereafter the shingle capping will be applied over it the same way as with a roof > 15°.
In special cases, when the insulation is between the wooden deck and shingles (the warm roof) and the pitch of this roof is between 4° - 15°, the mechanical fixing is mandatory.
Then the best and most recommended solution will be to torch APP shingles over this structure.
For slopes between 4° and 15°, IKO recommends installing an extra OSB or wooden wedge and raising the ridge with Armourvent Multi ventilation. This avoids water infiltration in case of ponding water close to this ridge.
Hips and ridges on a concrete deck
On a concrete deck, a piece of 30 cm is trimmed from Armourbase Thermo AD and torched on the top part of the roof over the last rows of shingles. Then the capping can be torched over this membrane. Given the density and thermal mass of concrete decking, ventilation is not required in the air space beneath the deck.
IKO Armourbase Thermo AD is a modern thermo-adhesive membrane.
The heat activated membranes of IKO Armourbase Thermo AD can be used with success in a wide range of waterproofing applications such as very low sloped roofs with concrete or wooden deck structure where bitumen shingles are applied without nail fixation. This membrane presents numerous and important advantages, such as easy application with consequential savings on time and the possibility to apply the material on surfaces which are not suitable to open flame.
