I've used celotex GA4050 under all my suspended floors. I'm now doing the last room in the house and the price from Travis Perkins has gone up massively. In fact I think GA4000 has been withdrawn from sale. There seems to be various other types of Celotex available but I'm bewildered as to what the differences are. Can anyone please suggest a cost effective alternative to the GA4050 I've been using please? Doesn't have to be Celotex. Many thanks. BB
Try Seconds and co on eBay. They sell rejected Kingspan. The main defects are a crease in one of the faces, or out of tolerance on thickness. Some may have a bagged corner or dent. None of which will be a problem for your intended use. https://www.secondsandco.co.uk/
That makes sense for a small order. They have a depot near York are so it's a no-brainer to pick up half price stuff just an hour away