More about lead as a building material.
Porous lead roof.
If there are porous slates or openings above the tears in the felt water may leak through.
In roof tiling and slating the author rejects this cautious approach.
Porous tiles lead to leaks.
For those who don t know porous in this case means the concrete roof tiles will let water through.
Correctly laid lead roof greyfriars roofing note the height of steps between bays the rolled joints and adequate overlaps problems.
Belzona liquid roof coatings are ideal for sealing the cut edges to prevent corrosion.
However over time damage can occur.
As the porosity of your tiles increase it means more and more little holes will fill the entirety of your tiles.
Compare them here.
Weather deterioration loose fixings and movement can result in roof leaks.
Whether you re renovating a house or just performing an exterior health check ignoring a poorly maintained roof can be disastrous.
A porous tile on itself cannot be as strong as a tile in a good and solid condition.
This is something that may be expected.
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.
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.
Acrylic sealants have similar disadvantages where butyl rubber sealants have the opposite effect that over a period of time become hard and brittle but.
Porous roof tiles can break more easily.
Porous roof tiles are weaker.
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.
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.
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.
Due to its durability and strength lead is a popular material for roof and chimney flashings.
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.
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.
Where such a problem is left unattended it will ultimately lead to widespread rot and decay.
Ice dams at roof eaves can be a serious leak source on slate as most other roof systems.
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