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Not sure if srs, but I was going to..

Have the SE letterhead but also radio silence, submitted to building control with questions and comments..

Well, it is designed as just to use the return, but personally I can't see this as being enough but I'm no builder or SE for that matter and wanted other options / opinions best practice etc. Thanks

Thanks Tony. As the extension inner skin is tied onto the existing house external wall using a wall starter kit, should the builder simply brick the return cavity, or tooth in the return cavity knocking out some of the external wall? I will try the SE again, thanks. Thanks for the drawing...

The question is really, can the beam be placed on the return brick work with the required padstone as per the structural calcs document. Is it best to leave this return cavity open, or ask the builder to brick this up or just use a cavity closure - want to ensure it's built right.

Hi Woody, the architect is missing in action and they sorted the struc calcs out ! :unsure: Wouldn't mind some advice on this tbh.

Hello all, Background, single story extension built with pitch roof, looking to now knock through and wanted to confirm the placement of the steel beams. On checking with my architect and structural calculations document and contacting these, it's not that clear on whether the steel beam...

Are we talking 30cm difference? Just a wooden beam fixed to the brickwork and the bifold fixed to the beam, it's only temporarily. Just need to keep the weather out, use some form of roofing membrane fix it with sealant, PIR on the back fixed to the timber with some screws done.

CT1, some form of glue and sealant, lots of it.

Use aluminum pressing to match colour of bi-folds PIR insulation on the inside.

Hi Spaceworm, Is there concerns, should I use someone else? I'd hate to get this wrong and end up paying more in the long run? Or on face value would the designed beams be expected?

Mentioning costs, due to the earlier design change with a single beam, plate welded to the top. Which way would be most cost effective?

For two beams cost is coming in at around £500 inclu VAT Paint and delivery. x2 152 x 152 x 30UC, S275 - 3480mm. 105kg each.

Hi all, Thanks for the feedback, reading through the comments I'll check these off with the structural engineer. One thing to point out, I made a major balls up here, the length is not 2.7 metre, it's in fact 3 metre knock out - meaning a beam requirement of 3.48 metre for 150mm bearing and...

Woody is it a good idea to bolt or weld them together, should this even matter? Is this for lateral forces?

Thanks for your feedback Woody, it's appreciated - I'll ask the structural engineer. It probably won't be dead on, but as I'm no builder maybe I'm asking the wrong questions!

Thinking about this is 152 steels even right? Surely if you use two, together they would stick out by 4mm as it's a 300mm cavity? Does it also mean the weight isn't proportioned directly over the 100mm brick?

OK struc eng has come back with the following: Double 152 x 152 x 30UC, S275, Side by side, bolted or welded together At each side 300 x 100 x 140 Concrete padstone. Assuming we trust our stuctural engineers, would this be sufficent? 100mm of the beam will sit onto the padstones? Thanks

Further to this, how is this type of steel beam going to work with a cavity wall? Is there an expectation of building another brick pier? As the steel cannot just be placed within the cavity? Then this defeats the point of the objective. I've gone back to the struc engineer to ask for two RSJ's...

Hi all, I'm in the process of building an extension. This post is in regard to an 20 year old house, masonry inner and outer leaf, not timber frame, knock-through is ground floor from existing external/outside wall into new extension. The structural engineer designed goal posts/box section...