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Option A. Armourvent Multi or Multi PLUS ridge vent
Ventilation area of Armourvent Multi & Multi PLUS = 275 cm²/m
This vent can be used as EXHAUST vent as well as INTAKE vent (check the product application manual).
Minimum linear m of EXHAUST (ridge vent) required over total roof = 2.000 cm² / (275 cm²/m) = 7,50 m
Minimum linear m of INTAKE (ridge vent) required over total roof = 2.000 cm² / (275 cm²/m) = 7,50 m
Option B. Armourvent STANDARD
Ventilation area of Armourvent STANDARD = 322 cm²/pc.
This vent is recommended to be used as EXHAUST vent.
Minimum number of Armourvent STANDARD required over total roof as EXHAUST vent = 2.000 cm² / (322 cm²/pc) = 6,2 rounded up lead us to 7 pieces. Armourvent STANDARD needed to cover the exhaust needs.
For the INTAKE you should choose the best solution for your project providing a continuous air flow and the minimum intake ventilation area to be equal with exhaust area (2.000 cm² in this example).
Which is better – too much intake or too much exhaust?
If an exhaust product (e.g. Armourvent STANDARD) is looking for intake and balanced intake is not provided, the exhaust product could use another exhaust product for intake and then you have “DEAD SPOTS when referring to roof ventilation”. Therefore, adequate or slightly more intake is better.
As long as you have a “balanced” system, you will not over ventilate your attic.
!!! Important:
- Install a “BALANCED” system 50% intake & 50% exhaust
- Install all exhaust vents at the same height within a common attic area!
Installation of the exhaust vents at more than one level on a roof allows the upper exhaust vent to pull air from lower exhaust vents rather than from the intake vents. Intake air must come from intake vents located near the lower part of the attic space to properly ventilate the total attic area and eliminate heat & moisture builds up! - Install only one type of exhaust vent within a common attic area!
Exhaust vent pulls air from the easiest intake source. Vent types cannot be mixed. The use of different types of exhaust vents could make one of the vents to act as intake for the other. Intake air must come from intake vents located near the lower part of the attic space to properly ventilate the total attic area and eliminate heat & moisture builds up!
As you can see above there are only few things that you have to do correctly to ensure proper roof/attic ventilation in all geographical areas in the world all year round! Good luck!
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!