minimum angle required on a flatroof shed to allow rain to run

londonTiger

Hi

I have a 6' by 12' shed which is apex. Very cheap one at that cost a grand total of £300.

I installed in a year ago and starting to hate it. It's structurally quite weak and it uses the absolutely bare materials. In fact the timber cost can't be more than £100. The framing is a complete joke at 1" by 1" spruce. The clagging is the cheapest of the cheap feather edge which sells at timber merchants for 99p for a 1.8m strip.

It's also apex meaning I don't really get the full height as the eaves drop down to 1.5m and the ridge is 2m.

I want to build a flat roof shed. and want to use the absolute bare minimum slope required to have the rain run down the roof without puddling. The more slope I have the same problem of poor interior height.

Additionally the shed is within 2 meter of the boundry edge so the maximum legal height of the structure is 2.5m. So the more slope I have the shorter the shed will be on the other end..

System

whichever finish you use will dictate the minimum fall - iirc they recommend that you design a felt flat roof at 1:40 which ensures that it's built to a minimum fall of 1:80 (or something like that anyway!)

londonTiger

the_r_sole wrote: »

whichever finish you use will dictate the minimum fall - iirc they recommend that you design a felt flat roof at 1:40 which ensures that it's built to a minimum fall of 1:80 (or something like that anyway!)

what do these ratio translate to in degrees?

zaax

http://www.wikihow.com/Build-a-Shed

There are plenty of plans and video's on the net on how to build a shed, a local builders merchant will provide the wood.

Buildbase have got some cheap wood at present.

System

londonTiger wrote: »

what do these ratio translate to in degrees?

my cad software shows 1:40 to be around 1.43 degrees!

Norman_Castle

londonTiger wrote: »

The clagging is the cheapest of the cheap feather edge which sells at timber merchants for 99p for a 1.8m strip.
.

Cheap clagging is never good. It should be clagged with good quality clagging. Instead of building a new shed why not just replace the clagging and frame then replace the roof of your current shed?.

adouglasmhor

londonTiger wrote: »

what do these ratio translate to in degrees?

Aproximately 2.5 and 1.3

londonTiger

adouglasmhor wrote: »

Aproximately 2.5 and 1.3

thats hardly anything. i assumed it would need to be at least 15 degrees or something

DTDfanBoy

londonTiger wrote: »

thats hardly anything. i assumed it would need to be at least 15 degrees or something

As previously mentioned, it is dependant on the type of cladding you use

londonTiger

Norman_Castle wrote: »

Cheap clagging is never good. It should be clagged with good quality clagging. Instead of building a new shed why not just replace the clagging and frame then replace the roof of your current shed?.

as stated in the original post, the shed is very short at the eaves at just 1.5m-1.6m and i can barely pile anything inside on the sides. i want to maximise the height and build a cube shed reaching as far high as the maximum allowable height of 2.5m under planning law.

i disagree with "just replace cladding" idea too. ive seen overlap feather edge shed last for 15+ years with no trouble as long as its lapped and treated there is no harm with it what so ever. Feather edge is a little bit draughty I will insulate the insides by nailing 5mm wbp ply on the inside.

the framing is much more important and there isnt enough framing on the cheap shed and its weak as well. also you cant really extend the walls taller, it has to be rebuilt from scratch.

i will build the shed from scratch using strong 2" by 2" framing and reuse the old overlap cladding. 1 wall will need to be cladded brand new as the structure is taller and uses more cladding I will use shiplap for that (the side facing neighbours fence). The exposed side will be left as feather edge and can be repaired ad hoc if needed.

I have got a quote from travis perkins, I would need 20 square meters of cladding to cover the shed and it would come to just under £300 for the cladding alone. So a bit expensive.

Additionally I have made a mistake and bough this cheap match box build quality shed for £300. I don't want to see all the timber go to waste as firewood so I want to use as much of the timber as possible and put it to use. The current shed has no resale value - it's micky mouse quality.

londonTiger

DTDfanBoy wrote: »

As previously mentioned, it is dependant on the type of cladding you use

jsut to be clear I'm not asking for the wall cladding slope. I'm enquiring about the roof slope.

It will be OSB with standard roof felt applied on top.