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Is there any easy way to calculate the required lighting in a room? Probably using 'some' downlighters or similar in an extension I'm building, which will be linked to an existing room making an 'L' shaped kitchen/diner/lounge. This room will have 4.5 metres of bi-fold doors along one wall...

Cheers Hugh, bottle gulley it will be then!

Thanks guys, some good links there The screws look good, prefer screws to 'nails'

Thanks Hugh, I will be less than 600mm so I will use the smaller chamber and save a few ££'s. The adjustable inlets should provide me with a bit of flexibility as I'm joining some old pipes to new. P trap Vs bottle gulley - Is there any regulations on this at all that I need to be aware...

When I get to putting the extension flat roof together, it will have 140mm Celotex onto of the timbers/firrings, the 18mm OSB board and I was wondering if the are decent screws on the market say 170mm long to hold this lot together? Longest I can find at screwfix are 160mm and these are £45...

Checking the Screwfix catalogue and see there are two types of ready made sewer chambers, the 450mm size and 270mm size. I need a new chamber for my house, where a 4" pipe will join into the sewer leading to the public sewer chamber. Also a rainwater down pipe will need to join in to the...

OK thanks, but I guess I could use foundation bricks if I needed to? A builder friend (who I finslly got hold of this evening), said that 4" walls are fine for a chamber in a footpath.

Finally dug out the new sewer chamber and pipe runs all looking good. My existing sewer chamber (the one I have to move) is built from a single thickness of brick, have regulations changed do I now need to build the new chamber with 9" walls? The chamber will only be a couple of feet deep...

As it's said, a picture paints a thousand words, than you very much, I can 'see' it now

Can this ducting go down beween the cavity of the two foundation walls, then duct fully through to the original wall? The 2 foundation walls will be filled with a lea mix anyway

OK thanks I'll go with the 3" then

Thanks guys, has great and I'll duct right through 100mm pipe might be an issue though, due to it's large size. I want the new air bricks to be just a brick down from the damp course and 110mm migh be an issue. Once I have he 150mm of hardcore in place, then the 100 of concrete, I'm left...

I have 2 air bricks on my house, that when I build the extension will themselves need to be extended to the new outside walls. Is there a standard way of doing this? Currently the air bricks are right under the damp course level on the house and id I extended them as is, then the new...

Hi everyone, Is there a standard for the thickness of pea gravel surrounding a 4" sewer pipe? I'm sure I've been told it's 3" around the pipe, dont want to put not enough and have the building inspector say I've got to dig out more ad put more in!

Thank you for all your help, really appreciated

Thanks Noseall Is that what the piece of pipe is called - a channel junstion? and this is fitted by cutting a piece of the original 6" pipe out and removing it, replacing it with the channel junction??? Thank you

Thanks for your reply, really appreciated I've been told to build a concrete/brick chamber by the water company, so the pre formed plastic chamber isnt going to work here. I havent mentioned 'choking' the 6" sewer down to 4" anywhere, have I??? I just need to join a 4" pipe into the 6" sewer

Hi everyone, First post, just discovered this forum and it looks very informative, so helping someone may be able to offer me some advise please I'm building an extension, have all the permissions required and I have to relocate the sewer chamber to a new position which will be outside of...