Fixing to Noggins

[grandfortune]

HI all,

doing my first install next week.
the sanyo HIT235se10 panels are being fitted landscape so im going to have to put noggins in to fit the brackets in the right place , my question is am i ok to fix to 4"x2" noggings between the trusses and then fix the brackets to the noggins,the Segen guy said a few installers do it this way?

thanks
grand

 

[solarsavings]

We often do that. If you use timber to timber connectors between the truss and noggin you gat a stronger joint.

 

[grandfortune]

timber to timber connectors?? ou got a google imae of that setup, was just going to pilot the trusses then drive a nice big hex screew in

 

[grandfortune]

ah i think i see what you mean, like joist hangers

thanks
grand

 

[Worcester]

timber to timber connectors?? ou got a google imae of that setup, was just going to pilot the trusses then drive a nice big hex screew in

You are not allowed to put a screw in greater than 1/9 the width of the rafter.

So to put an 8mm screw in the MINIMUM rafter width is 72mm. Oh, and it must be pilot holed to the correct diameter depending upon the screw specifications.

All as per the MCS requirements.

But you all knew that didn't you

 

[Worcester]

Also bear in mind that joist hangers aren't designed to resist uplift so you'll have to include a fixing method to resist that.

 

[Graeme Harrold]

I think by joist hangers "GrandF" means the shaped brackets for fitting joists at 90 degrees to each other and not the PV batten hangers.

 

[Worcester]

Graeme, I realised what he meant, that's what I was talking about, they are normally designed only to take a downward force and not uplift.

 

[solarsavings]

Timberr to timber connectors should be fixed using twisted square nails. You need double truss clips or pairs of framing anchors to do the job.

 

[grandfortune]

so can i fix whem uposide down as that will sort the uplift problem then pilot the side and screw a smalll screw in.

 

[Worcester]

WT?.... Scary questions:13:

Now you've forgotten about dead load.

So, would you expect a chippy to wire a house? :cowboy:

I STRONGLY urge you to get a proper, expert structural design done, else you will bring the whole business into disrepute.

It'll cost uou kless than £100 to get a deswign from a structural engineer, and for a few bob more he'll probaly do the calcs thatyou need done for the roof anyway.

Do the job properly, I don't ask my dentiist for my glasses prescription.

 

[grandfortune]

lol just think out loud, ive no worries in fixing them, one thing that does bother me now is i cant get a Roof anchor with a 90 degree turn for a plain tile, im wondering if i could use the pantile anchor and adjust the noggin im putting in, but then ill have the problem of enough depth in the roof truss, it will be easy to sort on the day but ill have to order all sorts of anchors and decide on whats best.