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I cant see how the compressive strength can be any where near that of a concrete block. Where it is a larger structure with more than one floor and a large roof, a structural engineer surely would be needed to do the calculations to ensure theat the overall weight pushing down on the blocks...

I have an extension at the back of my house, where it joins the existing building it has a pointed vertical joint. This has cracked slightly and I am thinking of replacing it with a sealant joint. I dont know which flexable sealant to go for though, any recommendations? Thanks

Right from what it appears to be, its 20 mm blue mdpe plastic pipe, I went home last night and stripped down and cleaned the compression joints and applied ptfe, re assembled and also replaced a few compression with pre soldered joints. Had a look this morning still weeping in some areas...

Its a light blue pipe and i would say about 18 years old.

I have just been installing some new pipework in the kitchen and i noted the water main is weeping very slightly. I have tried tightening the compression joint connecting the copper 15mm to the larger plastic main just prior to the stop cock. But to no avail. Where the water main comes up...

I understand where you are coming from and i am not arguing the legalities of it. My post may come across as a bit of "dave down the pub" but as i explained that is not where i am talking about. The questions i have are regarding what is required and who can sign for what. I am not a corgi...

From what i have found out, it may only be a problem if i sell the house and they ask for the certification. or the building inspector could ask for it then and there. But is it allowed to get get another plumber to sign off the said boiler? assuming he or she is corgi qualified. My...

So if i tell the building inspector that i installed it myself (being non corgi) can he then sign the building off? without the need for the corgi bit?

I have just built a new extension and knocked the room through to create a large kitchen. I had to move the boiler two feet to one side and into the new part of the building. At the same time we installed a new condensing boiler. Now the problem is, my friend who is a plumber installed it...

Thanks for that, although they are not flat on the back, two post formed edges and the tops are 40mm thick. Its the prima bushboard range. I was thinking off getting a jig off ebay for 30-40 pounds considering i might not ever do it agin. :D

I have just purchased two lengths of 4.1 prima kitchen worktops. I want to join them using the router and jig method in a simple L shape, however a lot of the jigs i find don't seem to have a setting for 665mm. I have seen some at 650mm and 700mm. Are there jigs that have a 665mm setting? if...