Although not entirely apparent to the naked eye, there are several layers of a typical roof which are intended to provide superior levels of protection to the underlying structure. One of the most common methods is to place a section of felt directly beneath roofing tiles.
Why is this strategy often employed and what benefits can it offer? Let us take a quick look at the reasoning in order to further understand just how far the entire roofing industry has evolved in recent times.
A Bit of a Misnomer
The term “felt” is widely used and yet, it does not accurately describe the material found below many roofing tiles and shingles. Felt is actually a layer of tar paper. This paper will be tacked to the underlying surface (such as plywood) immediately prior to the installation of shingles.
Many professional roofing services in Bristol will employ this technique in order to provide an additional waterproof layer. This method is also used in the event that a new section of tiles is intended to be placed directly over existing wood shingles.
Is Felt Always Required?
This is a bit of a loaded question and the answer will normally be determined by the roofing contractor in question. For example, felt might not be needed if an existing layer is already present.
In the event that the integrity of this layer is called into doubt, it could very well be prudent to include an additional level of protection in order to guarantee that moisture and water to not penetrate the cracks between the tiles.
Do you suspect that your roof is leaking? This might be caused by felt that is no longer functioning properly. It could also be a signal that more extensive work is required. As opposed to putting such a task off until a later date, it is much better to contact a technician at Multiform Roofing Bristol we will be happy to schedule a consultation.
Frequently Asked Questions About Roofing Felt Beneath Roof Tiles
Can damaged roofing felt cause a leak even when the tiles look intact?
Yes, damaged roofing felt can contribute to water entering the roof space even when the tiles above appear to be in reasonable condition. Small amounts of wind-driven rain can sometimes pass beneath tiles, particularly around overlaps, fixings, or areas exposed to severe weather. The underlay provides a secondary protective layer that helps direct this moisture towards the eaves rather than allowing it into the roof structure. Tears, deterioration or poorly detailed sections can reduce that protection and make rafters, battens or insulation more vulnerable to persistent moisture. A proper roof inspection can help establish whether the problem originates from the tiles, the felt or another part of the roofing system.
Does damaged roofing felt always need to be completely replaced?
Not necessarily, as the appropriate solution depends on the location, extent and underlying cause of the damage. A small localised defect may sometimes be addressed without replacing the underlay across the entire roof, particularly when the surrounding materials remain in good condition. Widespread deterioration, repeated water ingress or problems affecting several areas can indicate that more extensive work is required. The condition of the tiles, battens and supporting roof structure should also be considered rather than treating the felt as an isolated component. A broader assessment helps determine whether a targeted repair is worthwhile or whether more comprehensive roofing work would provide better long-term protection.
How can you tell if the felt beneath roof tiles is failing?
Warning signs can include damp patches in the loft, water staining on roof timbers, persistent leaks, or visible tears and sagging in accessible sections of underlay. Problems may become particularly noticeable after heavy rain or strong winds because moisture can be driven beneath vulnerable or displaced tiles. However, an internal damp patch does not automatically mean the roofing felt itself has failed, as damaged tiles, flashing and other roof defects can produce similar symptoms. Our experienced roofers will therefore trace the likely route of water ingress and inspect the surrounding roof components before deciding what needs attention. Identifying the actual source is important because simply repairing visible felt damage may not solve a leak caused elsewhere in the roof.
