How to fix apron flashing for gutter to polycarbonate sheeting?

[Pedro1]

Hi guys,

What would be the best option for sealing the gap between the gutter and poly sheets?

As you can see there’s no flashing and water penetrates between the two and drips under the verandah. 

Thanks

Pete

[JacobZ]

Hi @Pedro1,

Thank you for your question.

I've had a good look through our supplier Lysaght's roof & wall flashing architectural manual, and I can't find anything that looks like a logical solution to the issue. A roofer specialising in metal roofs would likely be able to custom fabricate something, but there doesn't seem to be an off-the-shelf style solution.

The only option I can think of outside of having something custom made up is to attach flashing tape to the top edge of the gutter and down to the poly sheet, then seal the edges with roof and gutter silicone. It's not a perfect solution, but it should work.

Allow me to tag @Nailbag, @Stuckster and @Dave-1 to see if they have any ideas.

Let me know what you think.

Jacob

[Dave-1]

Good Evening @Pedro1 

Now thats a tricky one. I first thought of aright angle flashing with the long side underneath your existing tin roof and short side up to the gutter lip. Not sure how to install it easily and think sealing it with silastic could be a problem.

Can you show us a pic of the underside area, I am thinking of something that can either catch or divert the "splashing/dripping" away from dropping down vertically. 

Just had a thought. 

Remove the hold down screws next to the gutter.

Install a piece of timber that is the same as what is under the sheeting all the way along.

Sandwich Suntuf Access Black Trimdeck Infill - 4 Pack between the new timber on top and the iron on top

This is then screwed through so the angle goes over the edge of the gutter but not too far Brutus 150 x 50mm x 3m Jazz Building Moulding Flashing you may need to shorten the 50mm side depending on your gap. 

So top down

Flashing,

New timber,

Trimdeck infill,

Old roofing,

Existing timber.

You will need longer screws is all.plus silastic for the old holes

Dave

[Pedro1]

Thanks Dave for the suggestion. 

Here is a photo of the underside as requested.

 

Below is a photo of the other side of the verandah which was built at a different time and has apron flashing. What is that called and would that work? It is riveted down to the sheets and the other end hooks over the lip of the gutter. The roofing sheets sit below the gutter though whereas the other side I’m trying to fix sits level.

Thanks 

[Dave-1]

Good Evening @Pedro1 

Yes that could work, Only worry is cleaning the gutters might be a bit painful if the short end of the flash travels too far into the gutter itself. If the rivets are into the gutter I wonder if the existing ones leak when you have a downpour?

Thank you for the photo, tho I think your existing flashing may be the easiest to do now that you have shown it. If you dont want that then maybe the one where you use a piece of timber to level up the flash so its only the nose that sits in the gutter and not worry about the padding part?

Dave

[EricL]

Hello @Pedro1 

I suggest speaking to the special orders team of your local store and asking them if they can do a Lysaght made to order flashing. You would need to trace the angle of the current flashing with pencil and paper. The gutter end would probably be just straight piece which you would need to rivet to the gutter as doing a circular end is not on offer. 

If your store does not offer that particular service, I suggest looking at the Consolidated Alloys 300 x 0.7mm x 10m Weatherflash. You can roll this flashing out and bend the top end to conform to the angle of the gutter. It can be drilled and riveted to your current roofing. Please note that this is soft aluminium and can be easily bent so please handle with care.

Please make sure to wear personal protection such as gloves and goggles when working on your project.

If you have any other questions we can help with, please let us know.

Eric

[Nailbag]

Hi @Pedro1 

My suggestion follows along the same line as @JacobZ . You need a custom made flashing that is essentially "U" shaped that goes over and into the gutters and the follows the profile of the laser light roofing. Additional silicone being applied where the flashing meets the laser-sheets will add further waterproofing from harsh winds during rain. This is an improved version of what you have already in the followup photo you provided. Hope that makes sense.

Nailbag