In roof tiling and slating the author rejects this cautious approach.
Porous lead roof.
However over time damage can occur.
Given that porous roof tiles are weaker than tiles that aren t suffering from the same.
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.
More about lead as a building material.
Correctly laid lead roof greyfriars roofing note the height of steps between bays the rolled joints and adequate overlaps problems.
If there are porous slates or openings above the tears in the felt water may leak through.
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.
Where such a problem is left unattended it will ultimately lead to widespread rot and decay.
Porous roof tiles can break more easily.
For those who don t know porous in this case means the concrete roof tiles will let water through.
Traditionally 30 felt was used at eaves as insurance against this problem.
This is something that may be expected.
Belzona liquid roof coatings are ideal for sealing the cut edges to prevent corrosion.
Understandably when you re dealing with a concrete roof this is a big concern because they are so exposed to the elements the last thing you want to happen is to have your concrete tiles fall off your roof.
Acrylic sealants have similar disadvantages where butyl rubber sealants have the opposite effect that over a period of time become hard and brittle but.
As the porosity of your tiles increase it means more and more little holes will fill the entirety of your tiles.
Whether you re renovating a house or just performing an exterior health check ignoring a poorly maintained roof can be disastrous.
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.
Ice dams at roof eaves can be a serious leak source on slate as most other roof systems.
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.
Porous roof tiles are weaker.
The more holes there are the more water can start to absorb and leak through your tiles with less difficulty.
Weather deterioration loose fixings and movement can result in roof leaks.
A porous tile on itself cannot be as strong as a tile in a good and solid condition.
Porous tiles lead to leaks.
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