Rafters sitting proud 12mm

handyeire · 26 Apr 2019

Hi, I have a roof of 10m long ready for felt and battens. It's a roof on a house built in 2002 with cut roof and had roof tiles. I'll be changing to slates. Been striped off but when I pull a string line, some of the rafters are sitting out 5-10mm mm. If and when I install new battens, will this effect my new slates in any way.
I was advised to run a planner up some of them but I don't want to go chasing my tail because on the other side, it's the same.

I don't mind if there's a slight dip here and there in the roof as long as it's not massively noticeable. Will it effect my slates in any way

foxhole · 26 Apr 2019

I would just plane the highest by 5-6mm then nothing will be out more than 5-6mm.

handyeire · 26 Apr 2019

foxhole said:
I would just plane the highest by 5-6mm then nothing will be out more than 5-6mm.

If it was one or two but don't want to go chasing my tail. What I want to know is if left, would it be very noticeable.

foxhole · 26 Apr 2019

handyeire said:
If it was one or two but don't want to go chasing my tail. What I want to know is if left, would it be very noticeable.

Depends how keen you vision is. I would notice.

^woody^ · 28 Apr 2019

Wedge the battens in extreme cases, but this isn't one of them.

datarebal · 28 Apr 2019

as above pack out low points carefully

handyeire · 28 May 2019

^woody^ said:
Wedge the battens in extreme cases, but this isn't one of them.

I'd have thought 12mm would have been an extreme case. After checking the most they were out was 9mm in places however most where 6mm. Was having a convo with a roofer and was mentioned to me this is quite acceptable. Aesthetically not so pleasing to the trained eye but we'll within the roofing guidelines. Was advised if over 3/4 inch then that's when one will have problems with slating. Anything under is acceptable or so I'm lead to believe.

^woody^ · 28 May 2019

handyeire said:
I'd have thought 12mm would have been an extreme case. After checking the most they were out was 9mm in places however most where 6mm. Was having a convo with a roofer and was mentioned to me this is quite acceptable. Aesthetically not so pleasing to the trained eye but we'll within the roofing guidelines. Was advised if over 3/4 inch then that's when one will have problems with slating. Anything under is acceptable or so I'm lead to believe.

If everything was supposed to be nice and perfect, then it would all be made in a factory, from plastic, by robots.

handyeire · 28 May 2019

^woody^ said:
If everything was supposed to be nice and perfect, then it would all be made in a factory, from plastic, by robots.

Yes, I have heard this saying before .

ajstoneservices · 28 May 2019

Cut roofs are built with any crown in the rafters facing up. Dont attempt to plane them out as that could weaken the rafter(s)
When you pull your string across the roof put a block at either end where you attach the string and use another of the same size to see how much out each rafter is. You can then pack between the rafter and battens to ease out the difference.

handyeire · 28 May 2019

ajstoneservices said:
Cut roofs are built with any crown in the rafters facing up. Dont attempt to plane them out as that could weaken the rafter(s)
When you pull your string across the roof put a block at either end where you attach the string and use another of the same size to see how much out each rafter is. You can then pack between the rafter and battens to ease out the difference.

Should have did this however just nailed in without doing it. There is a slight wave in the roof but some where only out 8-9mm And the rest only 5-6mm.

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Rafters sitting proud 12mm

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