Extending shed, with another shed - bolting to concrete base.

[WvW]

Somehow I have managed to get permission to take a bit of the garden to extend my shed. The existing shed is on a concrete base, so my plan is to extend this out to fit a standard pre-made 8x10 shed. I will then butt this up against the existing shed, and knock through (with appropriate supports for the roof of the existing shed).

It seems like all the sheds I see on the net are based on a wooden floor. Provided there is some form of damp proof between the concrete and the wood, in theory could I just bolt the new shed to the concrete base? That would give me a much stronger floor.

 

[Fintray]

Just make sure the sides of the shed overlap the base to help prevent water getting onto the concrete base.

 

[gaz1]

if your extending your wood shed use cross members at the rafters to keep it square before you take the rear of it down

note new pinelap sheds are poorly built you would be better using a thicker 3x2 or 4x2s and these can be fastened to the new concrete base if you are extending onto a new concrete base

 

[Agrismith]

For best long term results put 2 courses or engineering bricks under the walls of the shed with a dpc between the bricks and the wood.
Built like this with sufficient roof overhang you can actually get quite a good lifespan out of the cheap pre fab buildings. I know some stable blocks that have been up 30 years and they definitely aren't maintained.

 

[WvW]

For best long term results put 2 courses or engineering bricks under the walls of the shed with a dpc between the bricks and the wood.
Built like this with sufficient roof overhang you can actually get quite a good lifespan out of the cheap pre fab buildings. I know some stable blocks that have been up 30 years and they definitely aren't maintained.

Did wonder about doing this. Just need to check the height dosent go over 2.5m I think.

 

[Agrismith]

Did wonder about doing this. Just need to check the height dosent go over 2.5m I think.

I would modify the shed or see about custom ordering to allow it. Will ensure the best long term method.

 

[frank horton]

or knock all down and build in metal.....job done.....
with prop org...it's easy.....make the frame first / modular, then skin it with iso steel sheets.....
two blokes could make it water tight over a weekend...

 

[addjunkie]

Concrete base, ring of brick and self build extension to fit existing shed

 

[8ob]

As above,the chances of getting an exact match up in a ready made shed are very slim.

Bob

 

[WvW]

As above,the chances of getting an exact match up in a ready made shed are very slim.

Bob

Think you are right here. I've looked and while I think I could get something approximately right, it would be a bodge to get the two roof lines to meet into a single drain.

I could have a go at building it myself instead to be honest. The framework is simple enough. Just the roof which I haven't ever had anything to do with before.

 

[Agrismith]

Think you are right here. I've looked and while I think I could get something approximately right, it would be a bodge to get the two roof lines to meet into a single drain.

I could have a go at building it myself instead to be honest. The framework is simple enough. Just the roof which I haven't ever had anything to do with before.

Surprisingly cheap to buy pre made roof trusses

Home - Donaldson Direct

donaldson-direct.com

 

[WvW]

I will need to keep with the pent roof structure so the water drains to the common point. It will also hopefully keep my neighbour happy.

I guess it's fairly straightforward though. Keep the wall frames square, then just build smaller frames for the tops of those frames with the correct angle on them (9 degrees I think).

 

[gaz1]

Think you are right here. I've looked and while I think I could get something approximately right, it would be a bodge to get the two roof lines to meet into a single drain.

I could have a go at building it myself instead to be honest. The framework is simple enough. Just the roof which I haven't ever had anything to do with before.

thats not your issue finding a shed with the same height walls is, so its buy a taller shed

when taking the back of your shed off you keep it as thats your rare guide use 2x2s or 3x2s to screw it solid to length

matching the walls is easy as you measure from the top of the concrete to the top of the guide 2x2 measure the panel mark then minus the panels 2x2 or use the 3x2 trim those and remove from the panels

a taller shed will overlap the concrete fasten the wall to the guide 2x2 from the inside screw the sides up and the rear panel up

the alternative way is just as easy

take off the rear panel reuse it for the rear

buy 2x2s make a frame up
buy shiplap wood as your only building the sides, the roof just use 8x4s osb board and use your guide 2x2s for the roof

 

[mtt.tr]

Concrete base, ring of brick and self build extension to fit existing shed

This would be my preference, additionally the timber won't get wet and rot.

 

[WvW]

This would be my preference, additionally the timber won't get wet and rot.

Think this is the way I will go (or possibly just brick the lot).

 

[mtt.tr]

Think this is the way I will go (or possibly just brick the lot).

I'm a carpenter so I come with biases.

But brick plinth block then a thin coat render quick and easy.

 

[gaz1]

Think this is the way I will go (or possibly just brick the lot).

i wouldnt bricks is more of a reference of having a nice looking shed/garage

concrete blocks can look nice



really it all depends on you and what method that you use to build one as well as costs

 

[gaz1]

you will also find free concrete panel garage/concrete garage panels as well there just as good

i built next door one with him using a garage made into a shed and then just roofed it with him easy enough to do its all bolted

 

[Aerohead]

Family member demonstrating how NOT to join old to new sheds!

 

[Screwdriver]

Well I just finished a little job extending mine. By a whopping 600mm.

It's a tiny shed, 3x4m so the extra width made a massive difference. Plus I swapped the fall of the roof to give me a lot more headroom. The narrow strip is a thin concrete base, Screwfix self levelling compound on top. I just stuck a row of fenceposts up to make a rear wall and sheeted with some spare 24mm ext plywood. Then whitewashed it with some stinky paint.

The weird brackety things are temporary () structures for long lengths of steel stock, rebar etc, above that, narrow brackets for long lengths of wood. There will be a trapdoor to the left of the picture which allows me to store and manipulate 3600mm stock. I'll be moving the horizontal bandsaw in there too, next to the linishing machine. Plenty of room left for an eight foot work table.

Biggest problem was working around all that "stock" which has nowhere else to go. Especially the 2400 lengths of steel propped up in the corner. A right pain to work around but I dared not leave it outside, even overnight so I had to work around it.

All because my neighbour decided to replace his old fence and tearing out the hedgerow on my side gave me a fair bit more room to move into.