cliplock roofing iron

[zongatron]

Question -

Can you join up that cliplock roofing? That is, if doing a reno and adding width to the roof/iron, can i just slide it under the existing iron (on a very flat roof)?
It seems to me that wind would just blow the water under and cause leaks, or is there a way to join it?
Do i have to replace the whole sheet?

The sheets on their now are 8metres, and i need to add 2.5 metres.
Obviously undesireable if i can avoid removing 8m lengths just to purchase 10.5 m ones....

[pawnhead]

I doubt very much that you'd be able to slide it up under, and you wouldn't be able to get any silicone between the two surfaces to prevent capillary action dragging water up the joint.

I'd peel it all off removing the brackets as you go, and if you wanted to reuse it then start cutting up the sheets to give you at least 300mm overlap. Squeeze two beads of silicone on the bottom sheet, one at the top, and one at the bottom of the overlap, before popping the top sheet on and putting three pop rivets in each tray. Then smooth out the silicone that's bulged out from the joint, and put dobs over the pop rivets. Buy a few extra sheets for whatever you're short. At least that way, part of the roof is decent full length sheets, and can be left if you have to replace the old stuff.

There's no guarantees, especially if there's very little fall on the roof, so ideally you replace the lot with the right length of sheet in the first place.

edit: Put a couple of rivets at the top of the overlap as well the three near the bottom.

[Barry_White]

Can you build it with a step in the roof like the do on commercial jobs when the have a long run. They build a step in the roof and use a flashing to weather seal it.

Have look at the picture.

[zongatron]

Thanks guys,

Sounds okay with the rivets, could be the go, using these old sheets for part of the new job (which may have a cathedral roof so iron will be half length of flat bit) and ending up with only three or four that are joined then getting the rest of the iron new.

Cant do the step down roof as the roof is already real low.... im going to dig out the extension 100ml so its a step down from the old, but id need more than that for a step down roof in this case...

[pawnhead]

You wouldn't have to join them in any particular place. Minimize your offcuts, so just start with a long sheet from the bottom and cut what you need from the next sheet. Then start with your off cut on the next run. Keep going this way and you'll use all of your old sheets to maximum effect, although you may want to discard the last piece that you're left with rather than joining it with a new sheet.

[addo]

Cant do the step down roof as the roof is already real low.... im going to dig out the extension 100ml so its a step down from the old, but id need more than that for a step down roof in this case...

Make sure you're heading the right way on this. If the present structure is a bit marginal, is it the best policy to be "crippling" your extension to make it work (something I abhor)? Could the existing be reworked more easily to suit the new roof - maybe raising it's rafter height or changing its style?

Any sketches to share?

Cheers, Adam.

[zongatron]

i get what you are saying...
but in this case the step down is optional and im really happy with it......it actually compliments the rest of the design as i have a multi level thing going on to seperate the living area - > dining etc kind of like a slight oriental twist.....
it works really well in my head anyway....

still nutting it out...but getting real close

cheers