Any advice on how to fill this gap at the bottom of my garage wall (2.5-3cm) to make it neat? The wall surface is plasterboard, would concrete be ok?
Isn't that regular patterned bit of steel an airbrick?
Yep, I'll be making a wooden frame of some sort to make sure it's not blocked. Thanks for the reminder.
@mespilus started
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Any advice on how to fill this gap at the bottom of my garage wall (2.5-3cm) to make it neat? The wall surface is plasterboard, would concrete be ok?