Why Use Felt Under Roof Tiles

Some products use fiberglass mesh rather than felt as the substrate.

Why use felt under roof tiles.

A great benefit to roofing felt is that it can also act as a moisture barrier. When the hot air is rising through the house and reaches the roof any moisture in the air that condenses on the underside of the shingles will get caught by the roofing felt. Roofing underlayment or felt protects the roof deck from rain before the roofing is installed. Basemat the flexible base layer is saturated with asphalt for water resistance.

Felt otherwise known as underpayment is required when. This helps to prevent any damage being done to the wood decking in the long run. Felt underlayment also weighs more which can make it harder for roofing contractors to drag rolls of it up a ladder and onto a roof. More often than not the tile roofing outlives the underlayments and flashings.

Roof constructions where low level eaves ventilation is used in conjunction with high level ventilation often at the ridge line. Roofing underlayment or felt protects the roofing from any resins that bleed out of the sheathing. Sometimes called roofing felt underlayment roofing tar paper or roll roofing this is a layer of protection installed between the roof deck and the roofing shingles. Roofing underlayment or felt provides an extra weather barrier in case of blowoffs or water penetration through the roofing or flashings.

It also has a slippery surface which can sometimes make it more difficult to install. Non breathable roofing underlays are typically used for. This prevents damage to the internal spaces of the roof and building and creates an effective barrier against rain ingress as a result of damaged and cracked tiles slates. Felt paper is applied across the entire roof deck.

Commonly referred to as felt paper or tar paper common roofing felt is made of varying blends of cellulose natural plant fibers polyester bitumen or asphalt. Applications where traditional ventilation methods are preferred.