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My new extension is just about complete, but I understand that I need to leave the 70mm screed to dry out for around 12 weeks before laying an engineered wood floor. We would like to use the room in the interim but the bare screed is very dusty. Is there any way to temporarily cover or seal the...

Hi I used Rawl-4-All plugs for a similar situation, but after drilling enlarged the hole in the plasterboard and pushed them through. http://www.screwfix.com/p/rawlplug-rawl-4-all-mixed-wall-plugs-blue-200-pcs/8467g

SE has now replied to my email: "Using two steels is fine, although they do not necessarily need to be bolted together." "Please note that we specified the shelf plate solution because this is usually preferred by the builders" My builder said, "Where's he get that from? He's not the b*gger who...

My builder is nearly ready for knock through from my house to my single storey extension. Structural engineer specified a steel RHS 2550 x 150x100x5 with a 250x8 flange to support the outer leaf. I am waiting for a quote for this and expect it to be expensive and more importantly very heavy. I...

The ring beam is to be constructed by bolting 4 200x50 timbers run in parallel tied together along the deepest side (square section) they will be bolted together at 500mm centres using M12 bolts. This will effectivly result in a 200x200 mm beam.

Please bear with me I'm not very au fait with all of this, just trying to understand. I take it that I should specify breathable membrane this to the roofer? Will the BCO be OK with this.

Instead of the steel ridge and hip beams shown on the drawing we have on the advice of an SE constructed the roof with a 200 x 200 ring beam. Carpenter has also fitted the facia and the soffits, however the soffit is not ventilated. Is this likely to give me a problem with building control?

Whoops, should have said it's single storey and there are no other buildings in the vicinity.

My extension is well under way, almost to plate level. However, due to my structural engineer's recommendation to use a 200 mm timber ringbeam rather than steel ridge and hip as per the achitects drawing, the roof would end up 150mm higher than on the planning permission. Would this be likely to...

Thanks Woody, Architect didn't specify anything on the building regs drawing, but the bco is here tomorrow, so I will ask her.

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The wall of my extension will be approximately 120mm away from a 1.2 metre high retaining wall. Do we need to tank either the new or old wall or will the air space be sufficient? there will be an open gully along the base of the wall going into the rainwater drain.

Retaining Wall

Will be taking down my 20 year old conservatory at the weekend to make way for an extension. I have offered my neighbour any parts which are salvageable as he would like to build a conservatory. I wasn't involved in the construction and dont have a clue about how to go about taking it down...

End elevation

Both views

Thank you for the advice. I'm sorry that I didn't include any more detail than the crop attached. End elevation now included: Perhaps this will help?

End elevation.