Less expensive since you re simply adding another layer of shingles on top of the old roof your labor costs will be considerably.
Flat roof overlay.
It s for this reason that many people choose to go with an overlay roof rather than a full tear off.
Topseal has a range of fibreglass flat roofing systems including the topseal direct lay system that is specifically designed for the flat roofing.
Systems designed for sloped roofs such as asphalt shingles and concrete or clay tiles are installed by overlapping one row on top of another these systems work cohesively with the pitch of the roof to shed rainwater and snow as it falls from the sky.
Since flat roofs have little to no pitch the water would work itself underneath the shingles or tiles eventually rotting the substrate and.
The additional price is mostly related to the extra labor that goes into a tear off roof.
Ideal for flat roof repair and refurbishment projects watch our new rockwool flat roof overlay board video to find out more.
A flat roof that had been over coated with a liquid based system which itself is breaking down a bonded overlay would not be suitable although with some preparatory works a mechanically fastened overlay system might be an option.
There are two options for improving the waterproofing on your current flat roof either strip off the failing current system or to overlay it.