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Roofing a flat roof

Weebles

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Our flat roof guys have been great.  Though they worked very short hours compared to MBC (doesn't everyone).

 

With a flat roof you apparently need at least 18mm OSB to lay the roof membrane onto.  The standard MBC spec is less than that for a flat roof so we had to stump up some money to upgrade the roof deck to 18mm.

 

We have three different roof decks.  Here is one roof deck with the roof lights (more on those in a separate post one day).  

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The upper roof deck

 

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And a view of the lower roof deck and garage

 

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Some lessons learned:

 

OSB is not weather proof despite assurances from MBC that it would be OK.  It holds out for a short time and then water floods through the joins.

It was a pretty sunny summer.  But the downpours were bad.

Wish we had plastic sheeted the whole roof.

To be fair to MBC, the house is fine (as they said it would be) despite being flooded more than twice.  However, the stress for us, and the clearing up, could have easily been avoided.

 

We insect meshed all the gaps before the roofers started.

 

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The parapets are edged with this smart design.  

 

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 We drilled some drainage holes through the parapet walls for the roof drains.  Burned out the drill.  Got that as a wedding gift 18 years ago so him indoors was delighted to upgrade.  

 

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This is the membrane going down, on a felt underlayer.

 

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And the finished look (though the front of the garage isn't finished and can't be until the render is done).

 

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Learned from the building inspector that we don't have a high enough upstand on this roof / door combination so it will likely not get included in our warranty.

That was news to us and is one of the issues caused by not keeping on our architect.  We have definitely missed stuff like this so could have probably avoided a few problems.  

 

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So that's it.  Probably one of the easiest bits of the build so far.  However, we still made some cock ups like not allowing enough space to fit a window into an L shaped corner area.

This is the view from above and the window has to sit on the OSB bit.  Unfortunately that bit of roof sticks out a bit far.  We had to trim it on site and the roofer guys are going to come back and fix it another day.......

 

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A big lesson for us has been the ability to fix things on site.  Doesn't stop me losing sleep over them, but I think I am losing less sleep than I was over the "problems".

 

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