Number of roof fixings?

[JulianC]

We use the K2 'light' rail system and the manufacturer recommends support at 1200-1400mm intervals, with no more than an 800mm unsupported section at each end. Since most rafters we come across are spaced on 2ft/600mm centres we tend to fix the rails every 1200mm. So far, nothing has fallen off the roof....

 

[TJLinks]

We use the K2 'light' rail system and the manufacturer recommends support at 1200-1400mm intervals, with no more than an 800mm unsupported section at each end. Since most rafters we come across are spaced on 2ft/600mm centres we tend to fix the rails every 1200mm. So far, nothing has fallen off the roof....

JCDC- who makes the K2 light rail system?

 

[Mark.W]

As a rule of thumb I use a bracket per meter. So if you have 5 panels in a row and the panels are say .808 wide it would come to 4.166m including the retaining clips. I would then use 4 brackets. It doesn't always work this way because of the spacings between joists etc, but that is my rule of thumb.

Hope it helps

 

[Markc]

Various-Hilti and Shuco, no math on spacing just seemed strong with fixing every other one.

Hi Goodwill,

What do you think of the Hilti system. Alex from Hilti is on the forum and has asked to meet with me via email. I just don't want to keep endless stocks of different product on the shelf.

Mark C

 

[JulianC]

JCDC- who makes the K2 light rail system?

K2 Systems in Germany. :: :: K2 Systems GmbH :: PRODUCTS

Available over here from Alternergy.

 

[goodwilld]

Hilti and Alex are good, but a bit pricey but gives you confidence, the only request i had was to give the brackets some vertical adjustment to level the rails.
I have met Alex, he was promoted to UK PV Manager and a good listener, remind me to him when & if you see him.

 

[Wiggers]

Some of the Schuco rails will allow 1200 centres. (certain conditions) With the snow we have just experienced i would play it safe and put a hook on each timber 600mm apart. Remember its your reputation on the line if it sags or collapses. Dependent on the size of panel i guess 4x6m lengths of rail will be supplied. Allow for 40 hooks. You will probably find that you trim the rails down to just over 5m and use 36 hooks thoe. Its good practice to keeps a few spare hooks on the van.