TW Builds a Garden Office

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  • There were a few on-the-fly redesigns too - firstly to give me more space around the sides (taking something like 30 cm off the overall width) and secondly moving the floor joists on the rear half, so that I could attach the joist hangers properly.

    As it is, when I put the floor sheeting on, there'll be a little bit of jiggerypokery needed.

  • How did you level them to begin with? And are those feet the ones for decking frames? You reckon they'll hold the weight ok?

    I'll PM you now with my email address.

  • How did you level them to begin with?

    I used a water level (basically a hose and clear graduated tube) - I took one footing as a datum, and levelled the top of each cardboard form. problems crept in trying to get the concrete pour to the right level - Time constraints, slightly different hole volume, and one form being just over a safe mixer load, meant that I didn't always have the right amount of mix.

    The feet are for timber buildings - each one can take 450kg, so I'm well within tolerance

  • Somehow missed this thread. Watching with interest!

    How many skips you go through? I think I ended on 3, and then 6 skip bags that I'm still holding on to... Gonna have raised planters everywhere!

  • How long of an overhang will you have at the front out of interest?

  • I got rid of one 8 yard skip, and 3 skip bags, I think.

    I've 3 skip bags of soil (every bit riddled, which was back breaking to say the least) - Raised beds ahoy!

  • The front overhang is a 365mm (140mm at the rear, to give enough space to ventilate the roof, and 80mm on the sides, just because it looks a bit nicer than being flush).

  • This weekend has been all floor.

    It's safe to say that cutting 100mm PIR can get in the sea - I bought a proper insulation foam saw, and really struggled to keep cuts vertical and straight.

    I ended up using my track saw, and doing a lot of outdoor vacuuming to keep the PIR dust down.

    Today I measured and dryfitted all of the T&G chipboard subfloor - I would have glued & screwed too, but my caulk gun snapped as soon as I tried to use it.

    Then it was a race to cover it up when it decided to rain particularly heavily.


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  • Next up - Shifting 1000kg of oak sleeper to retain the path around the perimeter.

  • It's safe to say that cutting 100mm PIR can get in the sea

    Ugh, the thought of it sends shivers down my spine. Nice idea with the tracksaw. With a dust extractor connected too? If I ever have to do that kind of thing again I'll give this a go. I found cutting to exact size too time consuming so I ended up deliberately undersized by 10mm and then expanding foamed around all the edges later.

    Re the overhang, I'd consider making it a little longer if you don't have a compelling reason not too, it will really help keep the front of the building dry. With 365mm I think you'll get splashback from rain hitting the floor, and direct rain in mild wind.

  • How long do you reckon is long enough?

    I'm constrained by height (the longer the overhang, the higher it is), and how much overhang 2x5 can support.

    (And, to a insignificant extent, overall weight increase).

    I've drawn it up with a 100mm overhang, which is starting to look a bit unbalanced.

  • With a dust extractor connected too?

    Yep - Even loose fitting, it was pretty effective - the PIR is so light it all gets sucked in.

  • Yep - Even loose fitting, it was pretty effective - the PIR is so light it all gets sucked in.

    I wish I could go back in time and do it again

    How long do you reckon is long enough?

    Mine is 700 mm. Occasionally I stand under it and wish it was a tad longer but I think it's a good compromise. I did originally have it down to be 500 mm but when I put the first roof joist down and looked at it from the underside it just felt a little short.

    I'm surprised you can get away with roof joists of 2x5s, your span is 3.5 m?

  • I'm surprised you can get away with roof joists of 2x5s, your span is 3.5 m?

    Well fuck me.

    Somewhere along the line, I've managed to mix the roof rafters up in my Sketchup files.

    170mm is the depth I need for the span.

    That was close...

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TW Builds a Garden Office

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