Waterproof garden bar roof

[Kingbroady]

Hi.

I'd like to waterproof my 6x4 feet

garden bar, as much as possible, starting with the roof. I'm thinking 11mm OSB3, with 2 to 3mm shrinkage expansion accounted for. Then applying EPDM adhesive and EPDM membrane, followed by drip edge trims. Is this the right approach, please?

I've elevated it slightly to allow for air movement within to avoid condensation and mold.

The current roof is feather edged timber. I'm thinking of using some timber I have around the perimeter and vertically in line with the existing batons to allow better insulation and a more level base on which to lay the OSB. Again, am I on the right lines here, please?

Any thoughts appreciated. Thank you in advance.

 

[Kingbroady]

View attachment 417378

 

[jj4091]

Would you not be better with just EDPM on the roof or fibreglass, it's not very big or going to be taking any weight is it?

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[Kingbroady]

Just with it being uneven, I thought a flat base would allow the EPDM to adhere better. No additional weight to be added. I'd not considered fibreglass. I'll take a look.

Thank you.

 

[big-all]

general thoughts

that flap looks like perhaps 30" deep ??
my thoughts are it would be better perhaps the 20" mark as this would be more child younger person friendly at arms length and height wise[hinges still at the present position]

30" inch could contain a massive amount off stuff and a massive amount off leverage
where as 20" would be far less off a problem with perhaps half the load and leverage

keep in mind the pivot point for load on the front edge is not the front face/wall its back where the first line off support behind the front face to where the floor is supported to the ground

my suggestion is play and experiment with many widths and see what a couple off strong chaps on the outer flap edge "leaning heavily" can do

also worth noting racking will be a problem with any overhanging load as there is no diagonal bracing

 

[aveatry]

I used bitumen corrugated sheets on my shed about 12 years ago. And only thinking about replacing them because I stand on it a lot to get access to another roof and it's a bit dented in places