Self Build Timber Frame Extension

[AG_YB]

Hi All, 

 

Not sure if this is in the right section, I am looking at building a TF extension. Fully self built, I have been a bench joiner for the last 3 years, but me and my friend who have the business have never touched framing, site work, construction ext only ever cabinetry. 

 

I understand the basics of framing etc, but what I really am struggling to get my head around is all the differing options in terms of wall make up. 

 

I want to be able to draw my walls on sketch up to begin the design. It's a simple 5x8 rectangle rear extension, flat roof. 2 sets of patio doors and a sky light. 

 

What is the easiest wall make up, I'm considering either a brick slip exterior finish (so I can DIY) or a single brick if needs. What foundations would normally be associated with this type of build up. 

 

In my head I was thinking plasterboard, 6x2 with 120 insulation, osb, batton, brick carrier/brick, but after reading on here it seems I may need another layer of insulation? 

 

Thanks 

[Russell griffiths]

You will need some form of insulation to stop the cold bridge through the studs. 
 

an easy thing to do would be to look up loads of timberframe house builders, look on their website and find the technical drawings, steal some ideas from there. 
 

look up mbc timberframe, copy their twin stud idea and it will be the best extension in the street. 

[saveasteading]

I have always chosen real bricks rather than slips and am still inclined that way. This sits on conventional footings. Needs a bricklayer though.

I am also recently sold on the principle of a service void internally.

[AG_YB]

Could I ask why no to brick slips? 

[AG_YB]

Thanks Russel Griffiths - I've taken a look at that website and am now working on a version of one of those wall make ups. 

 

Maybe I can post on here later for people to cast an eye over?

[saveasteading]

38 minutes ago, AG_YB said:

ask why no to brick slips

Slips more expensive than whole bricks when considering the tray behind,

Less choice.

Bricks Stronger against impact,( weather?).

Spares down at the local merchant.

Any bricklayer.

Certainty of durability.

Corners and openings are whole bricks, not thin tiles.

Standard construction and detailing.

 

Basically if you want it to look like brick, use bricks.

 

[TommoUK]

If it's only 5 x 8 then SIP's are worth considering.  It's easy to design if you are competent on Sketchup, should be be millemeter accurate and there will be no waste.  Use as many standard panels as possible, and then work out your cuts to work around windows and doors.  You will have your walls up in a day.  Use a house wrap, batten it, then clad it in fibre cement cladding (hardie or cedar) or a render board plus silicone render.

 

 

[AG_YB]

@TommoUK I did consider SIPS at the very beginning, as I could easily make it the size of standard panels, and there are only two cut outs for 2 sets of patio doors, so each side wall is just a full run of 4 standard panels.

 

However I thought they were quite expensive, especially if used in the roof, compared to me stick building it. Although I'm not in that area of joinery, I build kitchens, wardrobes, media walls etc, I certainly have no problem framing walls and a flat roof. 

 

What do you see as the other advantages? Speed I understand, although I'm pretty confident me and a lad could frame, sheet and joist the flat roof of a 5x8 within two days. Maybe by the time I've added up all the components of stick built with internal pir insulation the cost is similar. 

 

[AG_YB]

Does anyone have a drawing of a timber framed construction (or Sips) with brick wall exterior I could look at, do I need to "tie" those two parts together and how does the details around doors etc look? 

Edited August 28 by AG_YB

[TommoUK]

4 hours ago, AG_YB said:

@TommoUK I did consider SIPS at the very beginning, as I could easily make it the size of standard panels, and there are only two cut outs for 2 sets of patio doors, so each side wall is just a full run of 4 standard panels.

 

However I thought they were quite expensive, especially if used in the roof, compared to me stick building it. Although I'm not in that area of joinery, I build kitchens, wardrobes, media walls etc, I certainly have no problem framing walls and a flat roof. 

 

What do you see as the other advantages? Speed I understand, although I'm pretty confident me and a lad could frame, sheet and joist the flat roof of a 5x8 within two days. Maybe by the time I've added up all the components of stick built with internal pir insulation the cost is similar. 

 

Probably not cheaper than stick build but it's quick.  I used SIPs Direct on an 8 x 6 outbuilding.  At the time is was £100 + Vat for a standard 2400m x 1200m x 144mm panel.  No waste, no cold bridging. I didn't use sips on the roof, I doubled up the joists as the span was on the limits but you could use posi joists.  I think the SIP supplier has a technical manual with all the construction detail so they may have a standard detail for brick slips 

Edited August 28 by TommoUK