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Or use ply. perhaps with an edging strip. would steer clear of mdf, but thats just personal opinion. and of course the sag issues compared to comparable thickness ply for instance.

Yes it can be done, BUT it is not recommended if you can't find the stopcock. Things can go wrong when fitting and will flood the place. Best to find an isolation first and test to see if it works. Really should be looking to fit a new stopcock first.

Or does the system have two, 2-port valves? instead of the one, 3-port valve near the HW cylinder.

You need to remove a litre of water from the system first before you add a litre of X400. (drain a little more to give youself some extra space). That is of course assuming that your only putting one, 1 litre bottle in. No need to shut system down if the radiator valves are holding...

Does sound a bit much money that’s getting forked out there. As has been mentioned before, by dormermike, (and others) add insulation where you can and make sure you have no draughts from places that there shouldn’t be any. Round the windows are a favourite place for draughts, badly fitted...

You will have to empty a lot more water than just the water contained within the expansion tank (and also within the expansion pipe). The chemicals probably will get through the complete system but will take a while to leach in the the main circulation. Would have been better to not only...

Use the time to try and source a valve cheap. ebay for example. Your in no rush so don't need to bid high. Whats it failing on? Any valve should last longer than that. Is there corrosion inhibitor added? Just some food for thought.

Posible problem :- The downstairs Myson valve sounds as if it is passing water through, this could be down to not moving its full travel to "off" position, or when it is fully off the water still gets through, thus heating your radiators. If the valve is not in its fully closed position there...

Another site to bookmark http://www.radiofeeds.co.uk/

Tried a heat gun? Still have to sand afterwards but removes the paint quicker.

Underfelt nailed to ply, Heavyweight mineral felt with cold applied adhesive, spread between the underfelt and mineral felt, nailed along the edges, will work. Also, Is it only felt that is being considered? How about EPDM membrane? Have you considered this as an alternative to...

Some additional info, Isoflex liquid rubber would work if you could find the area to be repaired, you can get it in b+q. Another posibility during a re-roof would be to nail an underfelt to the roof, then get a heavy grade felt, not the cheap "shed felt" though, use a cold applied bitumen...

Small scale test of EPDM covering. Plywood roof, wood edges were formed to create a drip edge and screwed onto the underside of the plywood round the edges. EPDM then glued, taken up the inside of the drip edges, with strips of wood screwed in place, gripping the edge of the EPDM, as well as...

The "Largs hum" could be on holiday down there.

Chipboard could also be 22mm. 22mm on ground floors, 18mm on floors above.

Had a very similar problem once. Changed both temperature sensors and cured the problem. Should be able to pick them up cheaply on the likes of ebay.

Water pressure switch faulty?