July 3, 2012

Installing Celotex XR 4200 Board

Filed under: Insulation, Roof — tattiehouse @ 22:23

Quick post tonight on my installation of the roof insulation….

Tools needed for the job include…saw,tape measure, straight edge, prop (useful), Makita drill (Other drills are available),long drill-bit, insulation, insulation fixings, aluminium tape.

I can justify 2 drills…..honest!

The EJOT TKR100 and HTK50-145 insulation fixing for the Celotex board is far cheaper than the standard offering (on most insulation sites) of http://www.twistfix.co.uk/products/insulation-fixings/warm-roof-deck-insulation-fixings-2-product.html. The twistfix option is just over £1 per screw, the EJOT option works out at 42p per fixing (the screw and the plug) including the delivery. I got mine from www.irpltd.co.uk and they were very helpful.

The picture below shows the setup and how it works – fair play, it’s pretty good and less thermal bridges due to the plastic fitting.

Straight forward enough to install the insulation, measure the space and angle then cut the board and install. My only tip would be that smaller boards are easy to handle but obviously involve more cutting to get into place. The fact the insulation is 200mm thick make the stuff awkward to put in. I’ve managed 8 boards so far and here’s the progress….

North side roof.

You can see the thickness here, 150mm is all a new build has installed (installed in a 200mm rafter with 50mm air flow void). As we are doing a renovation, we don’t have the luxury of 200mm rafters (although the purlins and other timbers in Tattie House are far better than any new build!) so we have to insulate on the inside and leave a 50mm gap for airflow between the rafters. The picture just about shows everything….

Finally the West side of the house….

More insulation going in for the rest of the week. Once in, the gaps in the joints and where it meets the timbers will be filled with expanding foam and then the aluminium tape to create the VCL – vapour control layer!



  1. Were you in the building trade before you camr to Rum? The TH looks in fairly good nick.

    Comment by neilking — July 4, 2012 @ 01:39

    • Hi Neil,

      The TH is in good nick when you pull back the lathe and all floor boards. It was built at the same time as the Castle and the materials used were pretty good and they must have had pretty good guys on the job. The house is very dry inside which would have helped preserve a lot of the timber and brickwork from decay.

      My background is IT and my last job was as a manager so all the stuff I’m doing is new!


      Comment by tattiehouse — July 4, 2012 @ 08:43

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