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Thanks for your input Morq and Mike. Will reply properly when I’ve had chance to consider.

Anyone seen these insulated panels before? I’m not really interested for the main structure but they sell them as roof panels only to be fixed onto timber frame buildings. Looks neat.

Thanks both. Currently working on a version that sticks with the main piers as shown (440 x 440) every 2.4m but adds single blocks (220 x 440) at the 1.2m points. Bit of a hybrid but I’ve got married to the idea of the main piers being 2 blocks!

If I’ve got my calcs right, then the spans between piers are currently: 2400 - 220 - 220 = 1960 Which I think is ok for 6x2 at 600mm centres. But I take your point…

The blocks I have planned are the large high density hollow blocks. I have quite a few remaining from a professionally built retaining wall. They measure approx 440 x 220 x 220. My plan is to place two, side by side, and fill with rebar & concrete, driving the rebar down into the rocky ground...

I'm running with this idea and trying the building slightly shorter, at 8.4m x 3.6m. This leaves 1.2m of covered decking. I'm also planning to run the raised decking around the front too but not including this on the plans yet. Since the 1.2m will be covered by the roof, I'm including this...

I'm gradually finding my feet with SketchUp. Very early days so far and I'm sure there's things I'm not doing as quickly and accurately as possible e.g. the 'snap' function when joining timbers doesn't seem as intuitive as I'd like. Just done the base so far, converting the hand drawn sketch...

Thank you for your reply - really appreciated and lots there to consider. The architect has been doing lots of work for us on a major renovation. So my chats with him have been very casual and tbh I'm half expecting him to look at my drawings (when eventually made!) and say they're fine to...

Sounds good Torx. What software are you using?

Exactly. Offcuts is an option as you say. Of course, 2700mm osb solves it nicely. Might make a few enquiries tomorrow.

Unless I’m missing something, none of the other options (400 / 600 / 16”) result in economical cuts to the PIR? Only the 450mm centres give you a nice 400mm space and therefore 3 equal cuts to a 1200mm piece of PIR…

A flaw in the plan… Just realised that although my 3.6m x 2.4m framework panels work perfectly for minimising cuts to studs, plates and PIR, the OSB sheathing would not land on studs centered at 450… arghh.

Sorry the Egger T&G is 22mm

Just sketched out a rough version of a design for the floor. I previously used 18mm ply (2440 x 1220) but as I’m trying my hardest to be resourceful, I can’t find a way to avoid cuts for this build. I like the look of 18mm T&G which comes in 2400 x 600 size and is readily available. The Egger...

Interesting thought. But I’m keen to keep everything simple. SIP panels are certainly appealing (I’m thinking rigidity and insulation value) but probably adds another complication for me to work out.

Hi Martin I’m not surprised you’re not clear… I’m not either! Agreed that some sketches posted on here will help so I’ll work on that asap. No - I’m planning to support midway between the 3.6m lengths. It’s just a question of how many additional centre piers (at the 1.8m point) would be...

Ah yes... thanks. I'm forgetting that the span tables are written for 'clearance'. So I have to remember the double blocks (440mm) reduce this span. Thinking about the block spacing across the shorter lengths, the side walls are 3.6m, so each of the floor joists will be 3.6 - 0.4 each end =...

Hi all I'm starting this thread to document my work on this new garden room build and hopefully get some pointers from far more experienced readers! A couple of times now I've asked questions on other threads, so thought it was time to start my own. Disclaimer: this project will be very much...

I should really start a new thread but just briefly, the ground is mainly rock. The word is in our address and I’ve read that a nearby cathedral was built using stone from a nearby quarry. But you are still making me doubt myself…!

Yep gotcha. A block work pillar sounds a lot easier than mixing and filling form work. I like it 👍🏼