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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.
Bitumen roof shingles may be one of the simplest roofing materials to install, but nevertheless they also require specialized and exact rules on how to be fastened. It is important to apply roofing nails in the right quantity and location to securely lock a shingle into its place. Accurate nailing affects the performance of roofing shingles and it is also required by the International Building Code.
Correct roofing nails
Roofing nails are used in roof installations to fasten shingles, to install the roofing underlayment for waterproofing and to attach roof tiles and sheet metal. There are different kinds of roofing nails, made of different materials and in various sizes.
A roofing nail should have a minimum nominal shank diameter of 12 gauge, 2,67 mm, and a minimum head diameter of 9,5 mm. Roofing nail should have a barbed shank until the head which eliminates nail pops, blow offs and roof leaks. A large nail head and heavier shank gauge provide greater holding power. All nails must be corrosion resistant; for example galvanized by various processes, aluminium, copper or stainless steel.
Nail length
Roofing nails should be long enough to penetrate the roofing material and go 19 mm into OSB, solid wood, plywood or non-veneer wood decking, or through thickness of decking, whichever is less. To determine the nail length, you should consider the number of layers of shingles, shingle thicknesses, underlayment and flashings (installed on eaves, sidewalls and valleys, etc.).
Some situations allow nails with less penetration above exposed soffits if extra nails are used. It is typical for garden houses, sheds or exposed soffits where the thickness of sheathing boards is 18-20mm. Check the local building codes and regulations.
These 2 pictures show inadequate penetration of the wooden deck.
The correct penetration of the wooden roof deck looks like this.
The correct penetration of the wooden roof deck looks like this.
The correct penetration of the wooden roof deck looks like this.
