Hi @haythorn_1, I got 2 timber windows (3G) and one insulated timber front door supply only from Russell Timber Tech. I measured them myself and they were all a perfect size. I was pleased with RTT. The recommended installer was pretty shoddy. They were supposed to use the Illbruck i3 system supplied by me (Compriband - FM330 foam - ME508 airtight tape). It looked such a mess that I removed the ME508 in one corner to re-do and discovered that they hadn't used any FM330 foam in the gap. I en
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