Spaced sheeting on cubicle shed roof

pms7

Building new cow cubicle shed this year. Looking for advice on spaced sheeting as getting different opinions on it.
Some think it is great, others have closed them off. 20mm is possibly too wide? Does anyone know if there is a minimum width in the grant spec?
Shed not in an overly exposed area, gable ends facing north/south.
Thanks

keep going

pms7 wrote: »

Building new cow cubicle shed this year. Looking for advice on spaced sheeting as getting different opinions on it.
Some think it is great, others have closed them off. 20mm is possibly too wide? Does anyone know if there is a minimum width in the grant spec?
Shed not in an overly exposed area, gable ends facing north/south.
Thanks

Around here its the thickness of a pencil beftween the sheets, roughly 6or 7 mm.

Cavanjack

pms7 wrote: »

Building new cow cubicle shed this year. Looking for advice on spaced sheeting as getting different opinions on it.
Some think it is great, others have closed them off. 20mm is possibly too wide? Does anyone know if there is a minimum width in the grant spec?
Shed not in an overly exposed area, gable ends facing north/south.
Thanks

Have it on some of the sheds here and it's a great job. Space of 10mm between sheets is plenty.

foxy farmer

Next door neighbour reroofed a 3 bay round roof and leanto in oct 14. Cubicles and feed passage. Decided to space sheet it. Used roofing nail as spacer between the sheets. Turned out fine and he's delighted with it.
A damp foggy day is worse than any rainy day and that goes for all sheds. Makes no difference if they're space sheeted or not. Moisture gets in everywhere.

patsy_mccabe

Do you just leave the timber purlin at the gap exposed, or do you cover it some way?

cjpm

patsy_mccabe wrote: »

Do you just leave the timber purlin at the gap exposed, or do you cover it some way?

The purlin should have plastic between it and the corrugated sheeting. Usually a roll of 4"DPC does the job nicely

Curtin's Moorepark got rid of the space sheeting over the cubicles this year.. I remember reading it in the Journal. They were blaming it for SCC problems. Not sure what gap they had between the sheets. There's a world of difference between a 5 mm gap and a 20mm gap

patsy_mccabe

There was a guy in the journal a while back that had a sheet raised every third one and overlapping the 2 on both sides. He had a length of timber nailed underneath to raise it up. Seemed like a good idea. Rain falling directly down wouldn't get in at all.

Sam Kade

patsy_mccabe wrote: »

There was a guy in the journal a while back that had a sheet raised every third one and overlapping the 2 on both sides. He had a length of timber nailed underneath to raise it up. Seemed like a good idea. Rain falling directly down wouldn't get in at all.

Yeah that would be better than spaced sheeting and serve the same purpose.

Miname

I put it on a shed last year and used a nail as a spacer. It doesn't let in rain but I honestly couldn't tell you if its of any major benefit.

sucklerlover

pms7 wrote: »

Building new cow cubicle shed this year. Looking for advice on spaced sheeting as getting different opinions on it.
Some think it is great, others have closed them off. 20mm is possibly too wide? Does anyone know if there is a minimum width in the grant spec?
Shed not in an overly exposed area, gable ends facing north/south.
Thanks

Built a slatted house in last grant scheme.my builder gave me a choice of spaced sheeting with 20mm gap and no raised canopy or a 5mm gap and a raised canopy.this was the grant spec he'd have to adhere to if I was to get the grant. He'd b fairly sharp lad. Don't know have specs changed though.i went with 20mm as raised canopy was more money.a little rain comes n but as it's cattle I don't mind. I think ur cubicle beds would get wet with 20mm gap.

Tyson Lannister

sucklerlover wrote: »

Built a slatted house in last grant scheme.my builder gave me a choice of spaced sheeting with 20mm gap and no raised canopy or a 5mm gap and a raised canopy.this was the grant spec he'd have to adhere to if I was to get the grant. He'd b fairly sharp lad. Don't know have specs changed though.i went with 20mm as raised canopy was more money.a little rain comes n but as it's cattle I don't mind. I think ur cubicle beds would get wet with 20mm gap.[/QUOTE

Your builder is spot on and the specs have not changed, but with the raised outlet vent you don't need to put in spaced sheeting although it is recommended.

pms7

Thanks for replies. I reread the grant spec, understood it this time!
My understanding is that 20mm over cubicles is too much, but spec says 20 if no ridge opening. Experience of others suggests 10mm fine, but must go for ridge opening then. Dept recommend not covering it. Guys with open ridge over cows passage, not feed passage are happy with it.

B.2.2 Outlet Ventilation shall be provided along the full length of the roof apex; 450mm wide for
a house up to 15m wide; 600mm wide for a house up to 24m wide; and 750mm wide for larger
houses. A ridge cap over the outlet is not recommended, but when provided it must stand
unobstructed and fully clear of the roof by 275mm, 350mm, or 425mm respectively, for the three
widths of houses noted above (denoted by “Y”, Figure 23).
Curved or angled upstands placed on the roof on both sides of the ridge outlet improve the
ventilation and prevent most rain access. This is a strongly recommended alternative to ridge capping. Under such upstands, the roof-sheet shall extend 50mm on each side to prevent rainwater
dripping from the upstand (Figure 23).
Where spaced sheeting with a gap of at least 20mm is installed over the entire roof, then a central
ridge outlet, though recommended, is not mandatory. Monopitch buildings, if fitted with a front
canopy, shall have a min. 275mm wide outlet along the length of the roof, positioned near the
highest point.
Note: Spaced sheeting is mandatory for any new roof in extension or conversion work where a full
ventilation outlet is not available.

9935452

pms7 wrote: »

Thanks for replies. I reread the grant spec, understood it this time!
My understanding is that 20mm over cubicles is too much, but spec says 20 if no ridge opening. Experience of others suggests 10mm fine, but must go for ridge opening then. Dept recommend not covering it. Guys with open ridge over cows passage, not feed passage are happy with it.

B.2.2 Outlet Ventilation shall be provided along the full length of the roof apex; 450mm wide for
a house up to 15m wide; 600mm wide for a house up to 24m wide; and 750mm wide for larger
houses. A ridge cap over the outlet is not recommended, but when provided it must stand
unobstructed and fully clear of the roof by 275mm, 350mm, or 425mm respectively, for the three
widths of houses noted above (denoted by “Y”, Figure 23).
Curved or angled upstands placed on the roof on both sides of the ridge outlet improve the
ventilation and prevent most rain access. This is a strongly recommended alternative to ridge capping. Under such upstands, the roof-sheet shall extend 50mm on each side to prevent rainwater
dripping from the upstand (Figure 23).
Where spaced sheeting with a gap of at least 20mm is installed over the entire roof, then a central
ridge outlet, though recommended, is not mandatory. Monopitch buildings, if fitted with a front
canopy, shall have a min. 275mm wide outlet along the length of the roof, positioned near the
highest point.
Note: Spaced sheeting is mandatory for any new roof in extension or conversion work where a full
ventilation outlet is not available.

A lad i work for has the spaced sheeting in a cubicle house. Not sure of the spacing but he says never again. The beds get too wet. The cows take a dry bed over a wet bed and they all have mats