If there are porous slates or openings above the tears in the felt water may leak through.
Porous lead roof.
However over time damage can occur.
Porous roof tiles are weaker.
Porous roof tiles can break more easily.
As the lead heats up during the summer it expands quite considerably and the silicone is not strong enough to resist this movement and will break hardly an effective lead flashing sealant.
The more holes there are the more water can start to absorb and leak through your tiles with less difficulty.
In roof tiling and slating the author rejects this cautious approach.
Lead is commonly used for flat roofs because of it s long life and ability to be formed to fit many positions lead must be laid and formed correctly to achieve this long life however.
Whether you re renovating a house or just performing an exterior health check ignoring a poorly maintained roof can be disastrous.
Correctly laid lead roof greyfriars roofing note the height of steps between bays the rolled joints and adequate overlaps problems.
Ice dams at roof eaves can be a serious leak source on slate as most other roof systems.
Http www fixmyroof co uk flat roof repair need a new flat roof.
More about lead as a building material.
This is something that may be expected.
Investigative work carried out on warm roofs covered in lead has shown that in rare instances moisture can also be introduced by the development of sub atmospheric pressure in the roof space.
Acrylic sealants have similar disadvantages where butyl rubber sealants have the opposite effect that over a period of time become hard and brittle but.
Belzona liquid roof coatings are ideal for sealing the cut edges to prevent corrosion.
As the porosity of your tiles increase it means more and more little holes will fill the entirety of your tiles.
Just a couple of damaged or missing tiles or slates will quickly allow water to penetrate a building s fabric resulting in damage to the timbers and ceilings below.
Given that porous roof tiles are weaker than tiles that aren t suffering from the same.
Even if the cracks or holes may be very small they could still affect the quality of the tile and make it less durable during storms or strong winds.
Compare them here.
For those who don t know porous in this case means the concrete roof tiles will let water through.
Porous tiles lead to leaks.
When a hot roof surface is suddenly cooled by rain the pressure in the area between the vapour barrier and roof covering can fall below atmospheric.
Due to its durability and strength lead is a popular material for roof and chimney flashings.
Traditionally 30 felt was used at eaves as insurance against this problem.
Where such a problem is left unattended it will ultimately lead to widespread rot and decay.
