Concrete garage upgrade or flatten

Concrete garage upgrade or flatten

Author
Discussion

Yazza54

Original Poster:

18,787 posts

183 months

Sunday 29th January 2017
quotequote all
Hi all

Hoping for some advice. I have a concrete sectional garage with a corrugated roof which I believe to be made of asbestos cement. The roof panels have a number of cracks and it's only getting worse. It's very damp in there not only due to the general lack of insulation but also the roof being knackered. Frankly stressed out with it, all my tools and everything are minging, I have a car in there and it's a terrible environment and I have had to put my motorbike at my parents house so it doesn't get ruined in there.

Not sure what to do, do I get a new roof and a load of insulation boarding fitted on the walls or flatten it and get something like this.

http://www.hansonsteelbuildings.co.uk/classic-car-...

Or one of these with the ultrasorb wotsit thingymajiggy roof

http://www.hansonconcretegarages.co.uk/knight-roya...

Obviously any of these options are going to be much more costly than modifying what's already there.

Anyone had similar problems??

roofer

5,136 posts

213 months

Sunday 29th January 2017
quotequote all
If its watertight at the bottom where it sits on the slab, put another roof on it.

Yazza54

Original Poster:

18,787 posts

183 months

Sunday 29th January 2017
quotequote all
It is yeah, it's just pissing in from above

What's best roof wise? I was thinking of just buying the corrugated metal panels and doing a replacement panel for panel but from what I've read that'll be a bad idea condensation wise.

Also any recommendations on how to insulate it?

bearman68

4,687 posts

134 months

Sunday 29th January 2017
quotequote all
I built both a garden shed, and a full sized workshop pretty much from scratch. Firstly I suspect the floor has not been dampproofed, so even if you fix the roof, you'll still get moisture coming through the floor.
If you have unlimited resource (and as you are on PH, this must be the case), rip it down, dig up the floor, and bury the roof under a new, insulated, and damp proofed floor. Make it at least 6" and stick a bit of reinforcing in there if you are going to jack things up on it.
Get some RSJ with floor plates on, and chemi anchor to you new slab. Make a series of goal posts depending on your size. Then you can 'infil' with 6*2 timber, bolted to the RSJ. Sheet the outside with poly damp proof course, and then sheet with steel sheets.
Insulate the inside with 8" roofing insulation, and then line with 1/2" ply, screwed to the 6*2. Complete this on all outside walls.
Paint white inside.
Fit lights and heater to suit.

Job Jobbed. Sounds terrible and expensive, but it's a brilliant summer project, and you'll have a brilliant warm and dry environment thereafter. For me, a 32m2 workshop extension cost about £4000 for materials, and a 8m2 garden shed about £1k - (Clearly you need the bigger version as it's more cost effective)

roofer

5,136 posts

213 months

Sunday 29th January 2017
quotequote all
Yazza54 said:
It is yeah, it's just pissing in from above

What's best roof wise? I was thinking of just buying the corrugated metal panels and doing a replacement panel for panel but from what I've read that'll be a bad idea condensation wise.

Also any recommendations on how to insulate it?
Just timber deck and membrane. Get some air in it, job jobbed.

Yazza54

Original Poster:

18,787 posts

183 months

Monday 30th January 2017
quotequote all
bearman68 said:
I built both a garden shed, and a full sized workshop pretty much from scratch. Firstly I suspect the floor has not been dampproofed, so even if you fix the roof, you'll still get moisture coming through the floor.
If you have unlimited resource (and as you are on PH, this must be the case), rip it down, dig up the floor, and bury the roof under a new, insulated, and damp proofed floor. Make it at least 6" and stick a bit of reinforcing in there if you are going to jack things up on it.
Get some RSJ with floor plates on, and chemi anchor to you new slab. Make a series of goal posts depending on your size. Then you can 'infil' with 6*2 timber, bolted to the RSJ. Sheet the outside with poly damp proof course, and then sheet with steel sheets.
Insulate the inside with 8" roofing insulation, and then line with 1/2" ply, screwed to the 6*2. Complete this on all outside walls.
Paint white inside.
Fit lights and heater to suit.

Job Jobbed. Sounds terrible and expensive, but it's a brilliant summer project, and you'll have a brilliant warm and dry environment thereafter. For me, a 32m2 workshop extension cost about £4000 for materials, and a 8m2 garden shed about £1k - (Clearly you need the bigger version as it's more cost effective)
As great as that sounds I don't want to be in this house for more than a few more years, it's more a case of trying to protect my belongings in the meantime!

richatnort

3,036 posts

133 months

Monday 30th January 2017
quotequote all
doesn't really help your roof problem but i came accross this blog that i'm going to do this summer to make my garage more organised, etc.

http://diyprojectsandstuff.blogspot.co.uk/2014/05/...

V8RX7

27,007 posts

265 months

Monday 30th January 2017
quotequote all
You can buy pre insulated steel roof panels relatively cheaply from Ebay etc