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Enlarging the living area of your house or building project often requires the reconstruction or remodeling of some parts of this building. Most of the time the existing roof is not suitable for the house addition, so installing a new roof over the additional square meters is usually required. When coming across a renovation project nowadays, you often see people choosing for a flat roof construction. This flat roof is an excellent and economical choice for an addition. A flat roof can be connected to the existing slope roof of the house and gives a very contemporary look to the newly added space.
Flat roof connected to pitch roof
A flat roof isn't actually flat; it has a slope of 2° - 3°. It appears to be flat, but it needs a slope to allow the water to drain from the roof. For slopes less than 9,5° we cannot install roof shingles. Instead the roof must be done with a modified bituminous membrane (e.g. Armourvalley) or other materials like EPDM, PVC or TPO covering.
Use of underlay and bituminous membrane
The colors of IKO Armourvalley membranes are matching the colors of IKO shingles. This creates the same beautiful look as on the main roof. Armourvalley is a high quality APP modified roll especially for roof valleys but it can also be used for low slope roof areas that are not suitable for shingles. Armourvalley cannot be applied directly on a wooden deck. First an underlay (e.g. Armourfix) must be installed as a base sheet. Armourfix is an underlay for IKO Armourvalley. This underlay must be applied with a good mechanical fastening; this means roofing nails or screws every 20 cm in all directions. Afterwards the IKO Armourvalley must be fully torched on it.
A very important detail is where the flat roof is connecting the pitch roof. Armourfix and Armourvalley membranes must be installed and extended 60 - 90 cm up the main roof underneath the shingles in order to assure a waterproof connection.
The starter strip and first row of shingles must be applied 25 cm from the bottom of the slope roof (or main roof) above the slope transition. The starter strip must be securely glued on the Armourvalley membrane.
Tip! Some roofers install a metal flashing under the starter strip to protect the lower part of the roof to accumulate water and snow loads.
Important! Remember: the slope of a flat roof must allow the water to drain from the roof. If water is not drained from the roof, any weak detail can be a potentially leakage in future!
Do you have an extention at your house with a low roof slope that is connected to a standard roof slope? Or are you planning to add an extention of a winter garden, an open-air kitchen or a garage to your existing shingle roof? Let us show you how to install a low slope roof and extended flat roof that is connected to a shingle roof with a standard slope.
First some basic information:
Standard shingles can be used on roof slopes from 15° to 85°. If the slope of your extension is higher than 15°, you can install any type of shingle you prefer or use the one that is installed on your existing main roof. Take a look at our roofing tutorial, which shows the installation of any type of IKO shingles.
If the roof slope of the extension is between 9,5° and 15°, then Cambridge Xtreme 9,5° is what you are looking for. This aesthetic laminated shingle can be installed on slopes from 9,5° up to 90°. For such a low slope installation, the roof deck has to be made of OSB boards of at least 22 mm thick. On this roof deck IKO Armourbase Pro PLUS or Armourbase STICK underlayment needs to be installed. Then install the roof according to the general installation instructions for the Cambridge Xtreme 9,5° shingles. The change of roof pitch between the low and higher slope should be made with metal flashing.
