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Ahh fantastic! Where can I buy those very thin tiles? I assume there's no problems to be expected with building control using them beneath the coping stones? I can't see why there would be but it's a minor deviation from spec.

Sadly not, the inner leaf is about 10mm above the outer but on top of that there is GRP profile that has a radius (which was the wrong profile but too late now..) which at it's highest point adds another 20mm = overall inner leaf 30mm above outer. We can't grind through the GRP as it's supposed...

Hi all, Due to complicated reasons involving the wrong trims for a GRP roof, the final level of the inner leaf of our extension walls is now between 20-30mm (30mm at highest point) higher than the outer leaf. We now have to put the coping stones on and are wondering how to bridge the gap...

Thanks. That is indeed the wording/intent of the regs but the final test can only be if the finished roof achieves at least 1:80, whatever it was designed to achieve. As you say, it probably won't even get looked at anyway... I just like to be correct by the regs for the sake of not worrying...

'Yes' to what bit? The roof will sag, they all do - but starting with the 50mm fall over 3m is that too little? The 50mm fall along the 5.4 gulley definitely will not sag, it can't.

You can pre-expand them a little so they're very snug on the drilled hole and then they'll grab as you tighten them - sometimes requires a little agitation to get them to grab initially. You'll find that a lot easier than reducing your already drilled 16mm holes to 15mm :) Although as above...

Hi all, I've designed and installed the timber work for a flat roof within a parapet wall on our self build extension. The fall is from the rear to a drain gulley at the front which exits through the wall in to a hopper. The fall from back to front over a 3.4 span is 50mm to 0mm which achieves...

Hi all, I'm in the process of self building an extension with a flat, warm roof - as such I need a qty of OSB3. The prices I see online at a quick glance seem crazy high, £25 ish per 2400x600 board. I have a trade account at local dealer which gets me down to about £20.. Still seems quite high...

I'm fixing them to a ledger plate just 195mm tall, looks like the strong tie hangers all have longer 'legs' than that - unless I'm looking at the wrong ones.

The manufacturer say that nails alone are sufficient and the SWL value is based on only nails.. However, I am going to bolt the hangers that carry the lantern trimmers through the ledger plate and into the blockwork behind, using studs set in resin. Seems like it's worth that little extra effort.

Plenty... what? :D

Hi all, I'm building a warm roof to our new extension. Rather than the joist sit upon the inner leaf block wall, we have affixed pole boards (195x47) to the wall using stud and resin, and now need to hang our joists (also 195x47) from those pole boards. There are also trimmers for the roof...

This is my view - it should be fine and I have certainly made sure there is sufficient vents around the new extension and connected air passages through to the existing house floor void, all by the book and I really can't see how a few high spots of concrete will effect the overall requirement...

The 150mm void is the minimum requirement: https://nhbccampaigns.co.uk/landingpages/techzone/previous_versions/2011/Part5/section2/default.htm Although as I say, I have no idea how well respected or policed it actually is! The only reason I haven't asked the BCO yet is that part of me is...

It's deeper than it looks... The soil on the outside of the ply shuttering was dry so the sides has slumped during excavating. The guy pouring the concrete saw the resulting deep wedge shape gap as the ideal place to lose the last half tonne or so of concrete! I would guess the bit you think...

I paid the groundworks guy to do the piling, including arranging the delivery and pouring of the concrete to form the beams. I was a bit disappointed at the relatively scruffy disposal of the excess concrete but hadn't realised until after making final payment that it was in places slightly too...

Thanks - it's not for a suspended timber structure, the foundation beams as opposed to slab are due to it requiring piling - made ground... If it were timber, hell yes I'd care about the ventilation. It's not though, so I personally am pretty happy to just accept that in some places it's not...

Hi all, We've recently had our foundations poured, unfortunately the chap that did it put the excess concrete in the area between the foundation beams, which is supposed to be our 150mm void. Picture below shows the over-spill of concrete that I estimate covers about 10% of the void area and at...

No haha! Not the neighbours toilet!! The neighbouring toilet, as in neighbouring onto the space in question - we live in a detached house ;) My only concern really is that by breaking through one stud wall to investigate the space available, that I have now removed the fire rating of the wall...