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As in raise the level with concrete in that location and sit the 4x2 straight on the slab rather than a bearer? If I fixed the bearers to the slab would thay not suffice?

I have installed a new suspended floor in our extension and it has worked a treat 8x2's with a large air gap underneath to keep things dry. I have hit a stumbling block in the new utility room. This was originally a garage. I had the original slab broken out and installed a vapour membrane...

Joists are 8x2's

How should I backfill arround this pipe to prevent any unwanted rodents entering my floor void. It is a new waste pipe running through the external wall. The outer side of the wall sits below ground level so it is unlikely anything would make its way through but just in case how should I close...

PA ratio for mine is .9 i believe which spits out 140mm rockwool. I think i will juts stick with the 100mm PIR as i have a fair few boards left over from the roof.

Building regs require it. BCO wants to see it before signing off.

The suspended floor is now constructed and ready to be insulated. I have a query on the thickness of insulation that i need to install. If my research is correct a minimum U Value of 0.25 is required but i have also seen 0.22 mentioned. The Kingspan U Value calculator says 90mm PIR is required...

I have the wall below to Insulate. It will sit behind some tall kitchen units housing cookers etc. I want to ply the wall before plasterboarding and skimming to give some good fixings for the kitchen and surface mounted electrics. In the rest of the house I have just bonded insulation to the...

The large air gap shown in the previous photos is to either side of the main area. This will feed a lot of air in but in the main area the air gaps are provided by gaps between the blocks under the supporting plate and between the joists (as below). Will this give enough airflow if i fully brace...

I had planned on putting a noggin/solid brace at this point but thinking about it today where the joists meet is the transition from the original house to the extention. I had wanted this left open to allow some nice airflow between the 2 areas. Is it OK to set the brace off to one side or the...

I have finished the front half and now on the back which is going far quicker as I have learn the process. Where the joists meet in the centre can they be screwed as well as installing a solid timber brace between them?

If a joist is sitting slightly low at the hanger end is it OK to sit some steel shims in the base of the hanger to sit the joist up?

I have an internal wall I need to hang joists from. Does the ledger board need to be fixed right back to this wall or can it be set off the wall using timber packers behind each bolt point to allow services to pass through?

Thanks. 14 along the rear wall from memory. I think only 1 has failed. Its in new blockwork so seems to have worked a treat. When I tighten the following day how mad should I go on the wrench? Tight then another full turn?

Infilled the right hand side as below. How tight should the bolts be into the chem fixing? They have been done up tight but could be cranked a little further. Guessing when it's all fixed together the bolts don't actually add much to the party in terms of pulling off the wall?

Thanks for the help JAK. It's much appreciated. On your points. Good to hear you dont see the lack of dpm to the ledger as being a major issue. Dpm has been installed bellow all "wall plates" to the dwarf support walls. The area to the right will have 2 more joists installed with a 1200...

Tha ks for all the help today. Day 1 is over and I THINK i have it off to a good start other than 1 mistake. Spent a lot of time measuring setting out and cutting material but it then made actually installing the joists very simple. Is there anything from the below that looks wrong before I...

JAK the boards are 2400 x 600 UFH boards. So I am setting out at 400 centers.

Shear strength apparently. Nails r something like 10 times stronger than screws in shearing failure.