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Indy,. Will PM you Regards oldun :lol:

Indy, Saw your post few days ago, but recently seem to get more bad days than good days, so am only just answering. Regard your question. The breather membrane is a secondary line pf defence for water shedding. The 50mm air gap is for possible interstitial condensation leading to oxidisation...

Thie above part is correct, how ever to comply with L1B 2010, the U value required for insulation between the rafters is 0.18Wm2/K (This is due to change 6th April 2014). To achieve this target, you need either 165mm Celotex between rafters or 100mm between and 65mm below. The other reason...

Without pics or drawing, and from your description, will assume roof is coupled with vaulted ceiling Assume vaulted due to steel beam and not ndge board. New beam built into existing rear wall of house and into new rear gable. Total run over all plates3200 = half run overall plate and centre of...

Back in the 50s when we used to hand cut and pitch on site, we called them raised ties, as the ceiling joists did not sit on the plate but were bolted on to the rafter to form the tie. These days they are called raised tie truss. When I was a lad, I asked the reason, and was told that they...

Okay. Done your experiment. Still makes sense to me. What is next? oldun :?

The old scrumpy lad is right Mark, except that he has said strip foundation instead of trench fill foundation. Dig and concrete founds, brickwork or block work to footings, blinded MOT to sub floor, DPM over and turned up footings and lapped over top, then concrete floor, Regard foundation...

What are you? Some kind of effing English teacher? Post makes perfect sense to me. Mark If I was building this for my-self, on clay sub ground, then I would go trench fill with foundations 1 metre deep with 700mm concrete fill. You could possibly cut this down to 900mm dig and 600mm...

The run on roofs is measured over all the wall plates less the ridge thickness, divided by two to give you half run from which you determine rafter size and rafter length. In your case it will be slightly different as your ridge plate will be 47mm in width and will only serve one half run...

Answer question below and will give you information required Is your run 3400 to outside of brickwork or to outside of wall plate? oldun

Well Joe, If you are in a good mood, you could always stick it up your ar*ehole, but as it would appear this is very seldom the case, we will have to give you a sensible answer. The current L1B Regulations (existing dwellings) are .18W/m2K. You do not require 300mm fibreglass as previously...

Long way to go yet then young friend. :lol: :lol: :lol: :lol: Regards Old Codger

How do you scrumpy boys paint on sand Stu? Got magic brushes? Keep yer head down and a8se up Stu. Gives you another 200 a day Regards oldun

Have been working with asbestos sheeting since the early 50s and providing you are sensible, in our opinion it is no more dangerous than crossing the road. However if you are of the nandy pandy school then bolt a 50x100 bearer each side, new 50x100 joists on jiffy hangers and mechanically fix...

As you are pitching on single skin wall, assume it is a cold deck with no insulation or air circulation required. If this is the case and roof is cross fall, then pitch straight on to wall, beam fill up to top of joists, facia 25mm deeper than joists and drip fillet to facia. Twisted hold down...

We started using blue DPM mid 1960s and if that is not a blue poly DPM, then I will eat FMT cat. Question. How can you paint a DPM on sand? The black material is either DPC or coat of Bitumen paint on two course of brickwork below DPC to bottom of all internal walls Patch best you can and...

We build and sell houses for a living. We have been using posi joists for the last ten years. Would never go back to solid joists. Posi joists normally have a 75 or 100mm top and bottom section width, depending on span.. Throw joists up at 600 centres and bump out floor with peel clean caber...

Sorry Tony, but the woodenhead wonderloaf is about right in this instance, providing B.C, agree. :shock: O.P. If you want to cover your ar*e stick a 150mm wide block in footing for section in question. Regards oldun

Roofs are so easy once you know your maths. On a 17.5 degree pitch, your seat cut on birds mouth is 17.5 degrees and your top plumb cut and heel cut to birds mouth is 72,5 degrees. Every pitch has its own secant. The secant is the length of rafter for every metre of span, For 17.5 degree the...

Yes beams must always be bedded on solid brickwork to the level required. No packing ever under beams We always run a DPC under beams and a 300mm wide DPC above beam with 200mm lapping block and beam so that visqueen can lap over. Regards oldun