I am trying to insulate my house more and can feel cold air coming though these gaps where my wood floor meets the brick/doorway. Can I polyfiller this gap or do I need something else to fill it in?
Thank you
Silicone is a better alternative than caulk and won't crack, but neither can be guaranteed to span a gap of more than 6 or 7mm without slumping. For bigger gaps, stuff some closed cell foam into the gaps (e.g Fossa Caulk Saver) pushed a couple of millimetres below the surface, then finish with silicone. Silicone can be purchased in a variety if colours. Use a silicone finger to finish the surface off rather than a finger - much less messy!
Compraband, a highly compressed closed cell rubber foam "tape" is what we use to seal around uneven floor edges (e.g. laminate flooring to original brick walls in mill conversions, etc). Brilliant stuff, expands to fill gaps from about 4mm to 30mm but I agree that it is rather expensive. But you do pay for speed, convenience and lack of mess
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