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Cheers Guys So is that basically 800 wide tread + 60mm per string +10-15mm fitting gap? So looking like 930mm ish?

Are you saying that you need to move the purlins to install the new rafters, or you are installing the new rafters in order to beef up the structure to move the purlins? In my loft conversion it was specified to install 6x2 timbers to the side of the existing 70mmx90mm rafters. However, this...

Hi Guys I am in the throws of a loft conversion. I am at the stage of dropping in the joists around the opening for the stairs. Setup designed by SE is 4 joists bolted together (175x50mm) at each end, with 2 joists bolted together as a trimmer 2.4m in length. However, I am unsure as to...

I am using Kingspan TP10 or Celotux equivalent which is a PIR isn't it? And I have been told that the insulation between rafters must have a lower u value than the stuff over the rafters so that you don't get condensation between the sheets. If you use 50mm and 50mm the u ratings would be...

Hi All Thanks for the advice. Lots of good useful stuff there. Just to clarify, I am not removing any purlins, actually there is a steel channel going in to beef up each purlin. So the only additional load on the rafters is the insulation, and the windows of course which will be doubled...

Cheers Deluks based on all the information, help and guidance I have what you are suggesting is most probably the course I will take. i.e. double up around windows with similar dimension rafters to that which is already there. Then draw out the existing with 2x2 as I would like to get 100mm...

Hi Deluks I don't have a membrane or felt etc. However, I am told as I don't have this and my roof is naturally vented then I can get away with a smaller air gap between slates and insulation. However, at 90mm my rafters are still too shallow to fit in 75mm insulation. I would like...

Hi there Thanks for your help. I would prefer to just bump out the existing rafters with 2x2 as that would be significantly cheaper, and also easier. This is one option I am looking at. BTW I need to have 100mm between the rafters and then 25mm kingspan across the rafters to sort the...

Cheers Mate I have asked the question, just waiting for a reply. I asked on here because I always like to get a couple of opinions. My view is the only way to do it is in 2 bits, joined at the purlin. If anyone has done this before I appreciate any pointers.

Hi Guys Quick question. I am carrying out a loft conversion. No Dormer, just roof windows. I need to double up the rafters, and trim for the roof windows. I also need to double up the rafters in order to install the insulation, as at 90mm the current rafters aren't deep enough. My...

Hi Mate I noticed on another post you said that your big truss was resting on rimber on the wall? I have been clearing our my loft ready for the guy coming next week to draw up plans etc, and I checked out my situation. My truss is also sitting on timber. What did you do in the end...

That's excellent mate, cheers. You have been a massive help. I will keep you posted on how I get on. First task is speaking to BC to get them on board, and also going to speak to an estate agent to get an idea of value we can add to the house. As there is no planning permission due to no...

Champion, cheers mate. My email ****REMOVED**** I am based in Gateshead, so not a million miles away. I see what you mean about the struts, ie relocating them to get the door in. Sounds like a good solution to keep the integrity of the structure, but make a clear route through. I am...

I've got you, so the King post becomes the juntion between the 2 doors, or at least the 2 walls with the doors in. Sounds like your space is the same size as ours. I meant to ask previously, if the structs are being removed, are you also removing the purlins and then supporting the rafters...

WOW I have been trawling websites looking for photos of lofts just like mine. That looks Identical. So are you going to hand joists between the C Channels either side of the tie beam and the party walls? Are you using joist hangers directly on the wall, or are you going to fix a timber...

Hi All I am in the very early stages of planning a loft conversion. I am pretty experienced with building work/DIY so intend to get a builder to do the structural work, steels, stairs, velux windows, and I can complete the rest. Have 2 friend sparkies, 2 chippies and a plumber so OK for...