Why is my extension "glued" to my house?

[fRAiLtY]

Hello,

My property has had a small "extension consisting of a dwarf wall and UPVC upper, I suppose like a conservatory but not quite as grand. Where the dwarf twin skin cavity wall meets the main house there is a 15mm or so gap filled with what looks like silicone sealant that has begun to crack and split.

The extension was done in the 90's I believe without building regulations, as we had to sign an indemnity policy. Other than that there aren't any other problems, but I noticed this gap the other day and I suppose I expected it to be toothed into the existing brickwork.

Is it OK just to re-seal the gap. There's no cracks in the property anywhere, I've just looked.

Cheers

 

[jeds]

When you clean out the gap, in preparation for resealing, you will most likely find some form of fixing system within. It might be a stainless steel wall starter or it might just be screws or bolts, but there will probably be something there. Clean the gap and reseal with a good quality polysulphide sealant. Don't be tempted by the £1.99 ones on the shelf. Go for better quality.