Detail for corrugated lean-to roof

10-10-20

Hi all,

I'm installing a corrugated roof between my house and the garden wall - a distance of 1 meter wall to wall.
I'm adding a gutter on the garden wall side, but the gutter will have to butt up against the wall as it's too high to place it above the top of the wall.

Here's a description of what I mean - 'U' being the gutter; left vertical being the house, right the garden wall.

|\
|...\
|......\
|.........\....|
|...........\..|
|............U|
|..............|
|..............|

(Please ignore the full-stops, they are there to make the graphic display correctly.)
In terms of having to affix the roof support to the garden wall, does anybody have a suggestion as to how I should achieve this?
I could run the roof supports out from under the roof panels and over the gutter, but as they will be wooden, they will be exposed and will rot.

Any ideas?

Poor Uncle Tom

It could be my meds, but I just don't understand what you are saying, sorry.

Poor Uncle Tom

Maybe I have it now.
The normal way is for the rafter to be fitted at the pitch with purlins running at right angles one at the top and one just above the gutter. The height of the purlins would ensure the sheeting cleared the top of the gutter. A wide DPC from the top of the end purlin and around the gutter is always wise. Also the felt should lap into the top of the gutter.

10-10-20

Fair enough! I'll try recap.

I have rafters running at a 15 degree angle from wall to wall with gutter on one wall.
I want to affix the rafters onto one of the walls, but also make room for the gutter. How do I achieve this without exposing the rafter ends to rain etc, ie, by not having them run above the gutter.

If a paint image would help, let me know.

Poor Uncle Tom

OK., lets assume the finished article is like this


with the garden wall on the outside of the gutter.

In the case shown the sheeting is fixed onto purlins running along the nail lines. These purlins are fixed on top of the rafters and the gutter is fixed to the bottom purlin.

If your rafters are spanning from wall to wall they will be below the gutter shown.

Poor Uncle Tom

I just found this,

10-10-20

Uncle Tom. Here's an image of what I'm doing.



So, my issue is that I wish to support the rafters on the wall, and not use a supporting post from the ground-up, and have a gutter. So the red box is what I need to fill in - per-say.

Thanks for your guidance so far!

10-10-20

Poor Uncle Tom wrote: »

I just found this,

That looks to be roughly what I'm after, but I'm working in wood.
Do you have a slightly bigger image?
Does that use the gutter as a structural member?

Poor Uncle Tom

Simpulls,

The battens (purlins) you are using should be deepened to the height of the gutter so that the gutter will sit on top of the rafter. The rafter can then continue down to meet a fixing joist on the garden wall.

Poor Uncle Tom

10-10-20 wrote: »

Do you have a slightly bigger image?

Afraid not, I was lucky I was able to even turn this thing on today...

10-10-20 wrote: »

Does that use the gutter as a structural member?

No, there is a purlin beside it.

10-10-20

Ok, good idea.
I'll measure up the dimensions for that. The only issue I foresee is that my head-room will be reduced by the deeper purlin and I can't push the roof higher. I may have to look at getting a metal rafter to compensate.

And don't I know a man with a welder...

Thanks!

Poor Uncle Tom

If you're caught for height you can change the pitch to 12.5 degrees.

freeluas

Anyone know of a goos supplier in Dublin for steel corrrugated roofing. I cant find any in Dublin?

freeluas

That should have read a 'good' supplier. Have called to several building suppliers but no luck. Louth is the nearest place I found.

Sonnenblumen

Smiths in Walkinstown or DPL in Kilmainham?

fiacha

I saw them in Goslins Cabra on Monday last. No idea what the price was.
A.