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Question: Is it necessary to use the IKO base or can any asphalt underlayment can be used?
IKO Base is an APP modified asphalt roll that serves as an underlayment under the upper asphalt roll IKO Armourvalley and is compatible with it. This means that it has the same attributes and "works" as IKO Armourvalley. If a different incompatible base roll is used as underlayment, the rolls may be detached from each other. Not using IKO base as underlayment might result in a malfunctioning roof, which might even lead to a reduction of the roofs water resistance.
Top asphalt roll
Use the IKO Armourvalley in the same color as your shingles installed on the main, sloped roof. Before torching the rolls, use side metal flashing to protect wooden constructions and the deck. Alternatively, use a different wood protection method to protect them from rain or snow.
Fully torch on the top roll on the underlayment IKO Base. Follow the instructions for standard asphalt torching. The joints of the upper roll must not line up with the joints of the underlayment. The layer overlays must be min. 10 cm. The top rolls must be torched all over the roof of the extension and must extend to the main roof with a steeper slope, up to approx. 40 cm above the slopes joint.The top row of the Armourvalley must be always covered or slide under the first row of shingles on the main roof.
Question: Is it necessary to use IKO Armourvalley as the top roll or any asphalt roll can be used?
IKO Armourvalley is a high-end asphalt roll offering several benefits that most other rolls do not offer. The asphalt in IKO Armourvalley is APP modified. It means that it can resist both cruel winter conditions and high heat temperatures. In the summer, the roof temperature can be up to 100° C, and even at such a high temperature the asphalt does not tend to soften or run down. This feature is especially necessary for roof slope between 5°-15° or higher, where differently processed asphalt could flow as a result of higher slope. Another advantage of IKO Armourvalley is the wide color range that matches IKO shingle colors. On the roof of the extension you will have the same color as on all other parts of the roof.
Installation of shingles on the steeper slope of the roof
On a steeper slope of the roof we start with a starter strip at approx. 15 cm above the roof slope joint. Then proceed in a standard way to install shingles, as mentioned in the video above.
If you follow these recommandations, you should be able to connect the roof of your extension to your shingles roof in no time. Good luck!
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Underlayment: a crucial part of every roof system
Do you agree that the roof is one of the most important parts of your house, especially as it protects you and your family from bad weather conditions? Let's have a look together to the underlayment shingle that IKO offers.
Take a look at the structure of a correctly installed shingle roof offering protection against all types of weather.
Shingles are not the only part offering protection, everything beneath them does as well. This invisible part is called the roof system. A key component of this roof system is the underlayment. The underlayment of a roof is a water resistant and waterproof membrane which is installed between the shingles and the wooden deck. As it is an extra layer of protection from severe weather conditions, the installation of an underlayment is mandatory. A shingle roof system without an underlayment is not covered by IKO warranty.
<<< Underlayment as part of the roof system
Types of underlayment
There are two basic types of underlayment used beneath roofing materials:
- Bituminous underlayment
- Non-bitumen synthetic underlayment
On the European market most synthetic underlays and breathable membranes are used as diffusion foils beneath wooden decks or wooden battens. They protect the insulation in case water would infiltrate through concrete or ceramic tiles. Diffusion foils cannot be penetrated with nails because the penetration between the membrane and the nail is not 100% watertight.
The big advantage of a bituminous underlayment is that every penetration by a nail is waterproofed. A bituminous underlayment is mostly used over wooden decks, especially under shingles or sometimes even under metal roofing as a safety hydro-insulation. We know many types of these underlays:
- reinforced with fibers or polyester
- finished with the sand or polypropylene
- self-adhesive or non-self-adhesive
