Block strength for single story.
- Thread starter iwanttodiy
- Start date
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Lol, sorry, 30mm airgap. Honest typo! :O
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http://www.ecotherm.co.uk/our_produ...inimum_of_thickness/eco-cavity_full_fill.aspx
It's not a standard board with a square edge which would allow moisture in.
On stonework with stones of different thicknesses a backing wall of blockwork was used in the past, but with these boards it isn't needed.
When they first came out most builders were a bit unsure about them, but they seem to have stood the test of time in an area of wind driven rain.
It's not a standard board with a square edge which would allow moisture in.
On stonework with stones of different thicknesses a backing wall of blockwork was used in the past, but with these boards it isn't needed.
When they first came out most builders were a bit unsure about them, but they seem to have stood the test of time in an area of wind driven rain.
Do you manage to keep a 10mm cavity all the way up?
There is no cavity on random stonework as they vary in thickness by a few inches. The stones are laid and the backs filled with mortar to the boards.
That way if you have some thinner stones with some thicker ones on top they are still stable.
It's the same principle as when we used to put up a 4 inch block wall as the backing wall.
With brickwork you need a gap to get your fingers round the brick, and also it's not really practical to lay them dead tight to the boards, but even with a 10mm gap the cavity isn't exactly clean.
However with brickwork most builders use batts as full fill with brickwork or boards and 50mm cavity, and only use full fill PIR on stone facework.
That way if you have some thinner stones with some thicker ones on top they are still stable.
It's the same principle as when we used to put up a 4 inch block wall as the backing wall.
With brickwork you need a gap to get your fingers round the brick, and also it's not really practical to lay them dead tight to the boards, but even with a 10mm gap the cavity isn't exactly clean.
However with brickwork most builders use batts as full fill with brickwork or boards and 50mm cavity, and only use full fill PIR on stone facework.
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