"Mark" wrote in message
news
Hi, My conservatory project is finally making progress. Underfloor
heating is down (presurised, but not connected, until the screed is fully
dried). Windowsill boards are on.

I'm not sure how to neatly close off the end of the cavity (as you can see
I am using unfinished brick).

http://img149.imageshack.us/img149/2097/dsc01660mq1.jpg

Any suggestions?

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There are special closers. they are Tee shaped with insulation. The
insulation fits in the cavity and one outer strip is nail into the brick
joint and the other is trapped behind the frame of the jambof the door or
window