Why Use Felt Under Roof Tiles

Felt paper is applied across the entire roof deck.

Why use felt under roof tiles.

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. Roofing felt is a layer of tar paper installed beneath the shingles to provide a backup waterproof membrane in case of leakage. 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 protects the roofing from any resins that bleed out of the sheathing.

The terms paper and felt are used interchangeably and refer to organic felt paper which is impregnated with asphalt and fillers to make roofing shingles and underlayments. This helps to prevent any damage being done to the wood decking in the long run. A great benefit to roofing felt is that it can also act as a moisture barrier. Roofing underlayment or felt provides an extra weather barrier in case of blowoffs or water penetration through the roofing or flashings.

More often than not the tile roofing outlives the underlayments and flashings. Basemat the flexible base layer is saturated with asphalt for water resistance. It also has a slippery surface which can sometimes make it more difficult to install. 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.

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. 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. Roof constructions where low level eaves ventilation is used in conjunction with high level ventilation often at the ridge line. Non breathable roofing underlays are typically used for.

Applications where traditional ventilation methods are preferred. The secondary purpose of sarking felt is to provide a waterproof barrier and allow for the safe disposal of water that has collected on the upper surface of the underlay.