Can I apply this system to a metal roof

Love it! Thank you John for all the info!

Try BattensPlus roof Battens the water flows through does not pond behind it

Tiles and slate are to keep the water out, the under felt is really a dust sheet and a temporary tarpaulin.

Very good explanation. Thank you.

LMAO ! Instalation failure! No battons! Code says there must be min. 1*2" minimum wood battons ubder flat tile, with gaps in battons every 4'

Excellent explanation of concrete roof system.

thank you sir!! now it makes much more sense as to why i have the same issues nearer my gutters.

Your “underlayment” is an old school built up roof clean and prime the surface at the valley, then install a new layer in hot or cold process. Or a layer of torch down polyester reinforced would be ideal

Great information, thanks!

Metal on top of the felt, not underneath.

try using battens

This underlay is prehistoric!! I wonder how old the roof is. In the uk we had an underlay similar to that called 1F but that was donkeys years ago. Now it’s all breather membranes n always hang tiles to battens makes no sense laying them to the underlay. Also, where’s the lead slate for the pipe??? They’ve just blathered it with mortar👀 yikes! Not the way it should be done

Thanks for the video, we use a very similar flat tile(12x16") to what you have shown here, it looks like there is not enough head-lap on those tiles we usually allow 4" of headlap and no less than a 22.5 degree pitch on the roof and the under felt would not be depended upon to weather the roof, I agree with you that profile tiles are better that flat because the interlocking channel is positioned higher up and so water flow cannot enter the channel as it can with the lower positioned channel on a flat tile.

The American way of roofing is strange. fixing concrete tiles directly on to the roofing paper is a long term recipe for trouble in UK we fit batten from ridge to gutter .Then battens at fixed gauge parallel so the tiles never touch the paper far better system. The proper way

I would have loved to see the repair of this area.

Tiles and slates are the most common roof coverings where I live but you'd never see a valley like that it needs a lead valley or other suitable metal or plastic to carry the water down to the gutter

Valley metal was installed improperly that’s what caused the leak

Thanks for the information

Sweet shit. I don’t get these where I am….. Got a slate tile roof once, and that’s even a rarity around here the city’s heritage dept was up my ass about materials being used etc. It was same as open valley shingle roof just copper not steel. This is a cool detail to see.