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You will not find a 100x65 air brick on the market. You will not find an external air brick with closeable vent. A 215x65 standard plastic louvered air vent has free air intake of 7750nn2. A clay or terracotta 215x65 air brick has an air intake of 1300 to 1400mm2 Are you and BC on same...

Because if you had bothered to read our last post, you would have seen the following Work to the formula iin AD H section 3.28 Page 46 Fit two down pipes to orangery and two soak ways to serve 21.5m2 each of total roof area.. We list a link that was updated in February 2014 which gives a...

Okay fellow, big old lump for orangery. Forget about BRE 365. Forget about Technical Note 10 that Fred the Tread posted. That formula is out of date and that technical note was brought out when they built Stonehenge. Work to the formula iin AD H section 3.28 Page 46 Fit two down pipes to...

Gary, Sorry, only just noticed that you have answered our last post Can not post tomorrow. but will do so Saturday Regards oldun.

Answer two questions and will give you all the information that you require including working out the maths. Is the 43m2 one side of the roof only? Have you got one or two downpipes to this section of roof? Regards oldun

Tony, No need to apologise for your input. We really appreciate it and at least you gave us some idea and did not try to duck the question or bull sh*t your way out of it. Tony, going to ask you a couple of questions, if you do not wish to answer, then we understand and will pay a SE to give...

Freddy, old friend, Serious question. Not knocking you in any way, nor taking the p*ss. Have you ever had calculations done by a SE to reduce P5 from 660mm return. If so, how have they done it? Would love to know. In the past have asked a couple of SE this question, and both answered they...

Okay fellow, sorry for extra questions, but wanted to satisfy our-selves that joists were of adequate size for dead load and snow load. Two options. First the way we do it which is more costly than the second option which is slightly cheaper. Target U value is 0.18W/m2K. To achieve this we use...

They are if you know the answers. The mix will depend on the strength and density of your blocks, how long wall is and expansion joints. Neither a polythene DPM or a liquid DPM will stop damp coming through. If it is a 1500 high full retaining wall, then a 215 block laid on its side is not...

Plasmor Fibolite do not have colour coding. Any decent bricklayer will tell the difference by picking up a block. 100mm 3.6N fibolite with a moisture content of 3%will weigh in at approx 8.3kg. Ditto 7.3N at approx 9.3kg. However when unloaded a 3.6N can weigh in at approx 10kg. Ditto a...

Simple answer Minimum fall for flat roof is 1 in 80 over 5.280 = 66mm Suggest you go 1 in 60 over 5280 = 88mm. That is a hell of a span for flat roof. What size joists you using, or have you got a central support? Regards opldun

The way you have described in your post is not the way to go. Have read Noseys post and need to ask you a couple of further questions to give you the best way to proceed. Have you formed a gable ladder all as noesey suggested Depth of existing joists . Width of span of the joists. Maximum...

Tell us what Celotex you have bought. If you have not got any yet then we will tell you which one to buy. What is the area of the roof? Give us this information and we will tell you the correct way to install. Regards oldun

Gary Sorry but going to give you a lot of problems. You now appear to be showing 450mm single brick skin below studwork. How you going so insulate that to the U value that you require? Also how do you intend to secure bottom plate to dwarf wall? Notice that you have not got the same storey...

Catlad is right. Timber purlins either vertical or angled to roof pitch do not require a pad stone. Regards oldun

OP, With due respect, you know nothing whatsoever about cut roofs. Leaving aside all the other PD conditions, then on a detached house. under PD you can come out 8metres . On all other dwellings 6metres is your limit, with a 4 metre max ridge height. A 6x6 metre full hip will give you a half...

Gary, Have you decided on your roof yet, as it will affect your stud work. Regards oldun

On a single storey extension of the size you are erecting, wind posts are not required, unless of course you live on top of a mountain. Wind posts are designed to span vertically BETWEEN FLOORS to provide lateral support for panels of brickwork. Windposts can be installed into either the...

Yes. Plenty good enough, but, whack it when down to fill any voids. Regards oldun

Who ever built it is certainly no bricklayer. The perps have not been buttered and filled. No attempt has been made to plumb the nib up, but most importantly has the nib been tied one way or another to the existing structure. We very much doubt it. As your girl friend has said, it will all be...