Flat roof for garden room

[Cadoxton Jack]

Span for joists is 3m including overhang of 300mm.

I intend fixing furrings on top of joists to provide the slope.

i understand that the thin edge of the furring should be fixed 5-10mm above joist to prevent ponding. Is this correct?
Should I fit fascia’s before osb boards or after them and should fascia boards butt up level against top of osb or butt up below osb boards. Intend fitting an epdm rubber roof. Thanks Keith 

[Nickfromwales]

1 hour ago, Cadoxton Jack said:

Span for joists is 3m including overhang of 300mm.

I intend fixing furrings on top of joists to provide the slope.

i understand that the thin edge of the furring should be fixed 5-10mm above joist to prevent ponding. Is this correct?
Should I fit fascia’s before osb boards or after them and should fascia boards butt up level against top of osb or butt up below osb boards. Intend fitting an epdm rubber roof. Thanks Keith 

A pic would really help. We'd need to see where water was supposed to head so it can discharge into the downpipes.

 

If it all goes wrong I'm only 20 mins from you so can drop some wellies off  

[Cadoxton Jack]

Very helpful 😡

[Nickfromwales]

1 hour ago, Cadoxton Jack said:

Very helpful 😡

9 hours ago, Nickfromwales said:

A pic would really help. We'd need to see where water was supposed to head so it can discharge into the downpipes.

?

[elite]

11 hours ago, Cadoxton Jack said:

i understand that the thin edge of the furring should be fixed 5-10mm above joist to prevent ponding. Is this correct?

I'm not sure what you are proposing here - can you post a diagram / photo?

 

I have just replaced a roof on an outbuilding (no furring), this was my buildup: Joist -> OSB -> VCL -> Insuation -> OSB -> Rubber

Fascias were fitted after the deck 

[ToughButterCup]

9 hours ago, Nickfromwales said:

A pic would really help.....

 

A picture is worth a 1000 words - helps us to help you....

[marshian]

No offence intended here but you’ve started several threads in specific sections related to your garden room project not everyone would have followed all of them. 
 

I think the first post which you clearly didn’t was typical forum humour which sometimes doesn’t translate to new members.

 

a sketch or picture helps a lot to understand what you are trying to do - i have an EPDM roof on my shed that I completely rebuilt last year - it doesn’t pool but I made the fall a little too much as in a good shower it can shoot past the gutters. Previous felt covered OSB roof was much shallower pitch and it pooled and rotted out.