Shed roof flashing?

[lennyzx11]

What’s the simple way of flashing from a clapboard sided wall to over a corrugated metal roof covering?

This is an open leanto. Butting to a wall under a 1 foot overhang.

2x10 header on wall with siding removed.
2x6 rafters on 16” centers
2x4 purlins on flat with 2x6 at top and bottom.

I planned on using flashing to go behind the siding and then over the tin roofing but wondered about the corrugations. Whether to use a filler or a lot of silicone to prevent water blowing back under the flashing.

 

[KennyG]

Unless I misunderstand, you are going backward. The metal flashing is a standard pole barn trim piece. After the purlins are on and before the roofing is installed, install the flashing over the purlins and siding. Then install the roofing over the flashing. If it is a sealed building, use sealing strips over the flashing and under the roofing that is fabricated to fit the corrugations.

Take a look at page 15 of this detail sheet. https://www.bestmaterials.com/PDF_Files/metal-roof-fastening-details-postframe.pdf

 

[Diggin It]

What’s the simple way of flashing from a clapboard sided wall to over a corrugated metal roof covering?

I planned on using flashing to go behind the siding and then over the tin roofing but wondered about the corrugations. Whether to use a filler or a lot of silicone to prevent water blowing back under the flashing.

Need pictures.

 

[Diggin It]

Take a look at page 15 of this detail sheet.

I think he wants page 21. Or page 36 using Flashing ASW-1 for Residential.

 

[lennyzx11]

Here’s the pictures. I’ll go read through the links and pages now.
That’s why I wanted to ask before I place that top purlin or any corrugated tin roofing.
It is a tight 3:12 pitch BTW.

 

[Diggin It]

I would use the ASW1 or similar flashing and start at the red line I've added. I'd probably caulk the edge into that corner also.






.

 

[747driver]

I would take the existing eave trim board off first. Put your purlins flat side down. Then run your roofing all the way to the where it touches the existing siding and caulk that seam.. With the eave board off you will have room then to install flashing from the existing side wall to your new roof panel. Install the rudder/foam closure weatherstripping between the roof panels and flashing. Then put your existing eave trim board back on. This will keep your lean to connection tucked under the existing wall eave for better weather protection and a nice look.

 

[Diggin It]

^^ I would leave the existing trim board and put the metal flashing over it as noted. But I might be inclined to add another PVC 1x3 or 1x4 trim board over top of the metal flashing. They're fully weatherproof and don't even need to be painted.

 

[lennyzx11]

Great Suggestions and Thank you all! I’ll start hanging metal tomorrow.

 

[747driver]

I had thought about at first doing that. I just like the look of overhang eaves. Plus you wouldn't have to box in the ends to keep critters and weather out.