Air bricks and condensation

Question

We have a cavity of under 30mm with no insulation. we are insulating the suspended floor due to damp. The air bricks we feel make the walls cold causing condensation. Does my cavity need air flow.? should I replace air bricks with telescopic ones.?

Stanislovas · Accepted Answer

Yes very important air flow if you close you have big problems you need extended air flow

Ian · Answer

Just remember  condensation  is usually caused  through  lack of air flow  in the room

Paul · Answer

Your cavity should be left clear and allowed to breathe if it’s an older property. 

You should have the damp problem investigated by some one component in structural damp proofing or PCA Approved contractor.

Neil · Answer

houses need to breath and air flow is very important.if you have no air flow you can end up with dry rot on your floor joists.

William · Answer

yes you need air bricks telescopic vents is a must . or  you will be getting damp thanks William

Mark · Answer

Bottom line is you need air flow under a suspended floor. Air bricks should be left, to maintain the air flow  under your suspended floor.  You can insulate between the joists and on top of the joists to get a better UValue.

John · Answer

Cavity walls do not require air bricks /air flow. Air bricks are to allow air flow under suspended floors. Or in certain situations such as gas fires and boilers to allow fresh air to enter the property.

Mark · Answer

I have the same situation in my house. 50mm cavity. I can find no-one to fill the cavity due to the small size. telescopic vents are only generally used when you have a block and beam floor or continuing an old floor through a concrete one, so I don't think that would help! The only real way to warm the rooms up is to clad either the outside with solid insulation and render or baton and clad the inside with solid insulation.  As the outside of my house is 'brick' ,I don't want to do that and by doing the inside you lose some space and have to re-jig your skirting and sockets !! It's a hard choice but the only real options. I hope this helps

Daniel · Answer

If it's a block and beam floor it should have air flow underneath your floor to prevent mould and damp 

The floor should also have a damp proof membrane with insulation and floor screed

Air bricks and condensation

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