Workshop shed build - planning stage

[mickthetree]

Afternoon all

Time is coming to replace my current workshop (7m x 3m concrete wall garage in poor repair and in the way of our house extension).
I plan on building a 7m x 3.6m shed as this will allow me to build using standard 3.6m lengths.
Finances wont stretch to a Mike Style workshop, but it needs to be warm, dry and last as long time as possible. This isn't my day job but I do spend a considerable amount of time in there.

It might be that I use this shed for my machines and use a smaller shed next to it for hand tool work and my workbench.

Base
Hardcore from the garage knock down, compacted, blind with sand, compacted then concrete slabs.

Floor
7.2m C16 joists running the length with noggins between. I had planned on using 8x2s and sitting it direct on the hardcore. Perhaps a smaller size if sat on the concrete slabs. 18mm ply screwed onto the top of the joists. I can get a good price for these secondhand but in good condition.

Walls
50 x 100 CLS @ 600mm centres. Top and bottom wall plates. Internal 18mm OSB. External building paper, battens, 150mm feather edge.

Roof
50 x 100 CLS made into trusses. External - 18mm OSB with felt. Should I put a building paper over the OSB before felting?

I do have the corrugated asbestos roof from the current garage which is in good sound condition. Seems a shame to dispose of it (and the cost associated in doing so) when it could be reused. This would mean reducing the width of the new shed to 3m wide to suit. I'm not sure how a corrugated roof would be attached to the timber frame? Timber battens over a building paper and fixings through the original holes perhaps.

Doors / windows
I will require double doors on one end and would like to get a long window down one side. I am hoping to pick these up second hand in advance and build around them.

Insulation
The voids in the walls will be ideal for adding insulation, however if this shed becomes the machine shed only and the other shed where I spend more time then I might forgo the insulation in this one.

I have looked at a number of off the shelf sheds and by the time I have bought them up to this spec I believe I can build one cheaper.

 

[Paul200]

I think you could easily build a bespoke workshop far cheaper than buying it ready made. I'm building a 5m x 4m Sitooterie (garden room/summer house), fully insulated. The roof covering, doors and windows were free and so far I've spent just shy of £2k - with nothing further to buy.

Difficult to compare like for like because ours is our own, slightly odd, design but the nearest I've found are anywhere between £3.5k to £7k to buy. And in a few weeks time I can say 'I built that'.

 

[mickthetree]

Good work. I'd really like to get mine in under £1500 if I can. Might have to start scrounging some materials and looking out for bargains now.

 

[will1983]

***** Post removed by member *****

 

[Adam9453]

I built mine over the last couple of months and have done it for less than £1500, its 7x3.7 metres.
I actually bought a second hand shed which was bigger than I needed, so I could cut it down to the size I wanted.
Meant it was quick to build and saved a chunk on timber costs.
FYI the shed I bought was 7.7x3.7 metres and cost me £350! please note though that I had to hire an enormous van £80, drive there £45 fuel, and two friends and I took 10.5 hours to dismantle and load it into the van.
Unloading it wasn't too bad as there were four of us but it still took a good hour.
I had to repair a few areas of rot and mould and buy all new roofing materials for it (we wrecked the roof removing it) but as I say all in came in under £1500. Similar shed would probably set you back £5K-£6K IMO

 

[Mark A]

I wouldn't do away with insulation, personally.

If this shed's going to be dedicated to machinery then there's two issues to consider - condensation and noise. Cheap fibreglass insulation would go a long way to solving both problems.

Mark

 

[mickthetree]

Mark you are right. I had only considered the heat aspect, but noise is an important factor.

 

[MattR]

Heh, sounds similar to the position I am in!

Still trying to work out quite what size I need for my new shed, specially as it also needs to house some garden tools, but I'll be watching this with interest1

Being as before this, the biggest thing I ever built was out of lego, I am slightly worried Im going to bite off more than I can chew :$

 

[John15]

Matt,

Build it bigger than mine - it's 4m x 2.4m and it's too small.

John

 

[mickthetree]

I have the space and like the practicality of building using 3.6m lengths as these are standard timber lengths