Slate fixings

P

powervan

• Oct 19, 2011

• #1

Ok got first slate job in a week! new slates ! just been reading on net that the screw through the slate type is non compliant with mcs! the neighbours hse to this job has used them so when i remove a tile and replace with lead client bound to say Y havnt u used same type as u dont have to damage the slate!! i think for 25yrs the lead is best but whats the GENERAL opion PLEASE!
bracket ref number would help !

 

OP

J

JulianC

• Oct 20, 2011

• #2

Always use the Unirac post and flashing system for slate - available from Dulas.

 

The Solar King

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• Oct 20, 2011

• #3

Remove tiles over joist, make lead flashing. Use Schuco hanger bolt SCH-259583 fixed through flashing into joist, sealed with sealing washer on bolt plus leadmate. Re-tile around. Frame attached using right-angled brackets SCH-259665 (called hanger bolt adaptor). You will need to cut the bolt down in length once fitted to prevent fouling and interference with panels, plus to allow access to fixing screw to rail. Picture is on a Scottish Roof which is close boarded and does not use battens to support tiles. Detail would be same on an English roof.

 

OP

G

GaryM

• Oct 20, 2011

• #4

An eylet crimp for the bonding conductor would make a much more reliable connection.

 

SolarCity

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• Oct 21, 2011

• #5

Ouch! I don't like the idea of the hanger bolts at all.

 

Worcester

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• Oct 21, 2011

• #6

@JulianC, If you are going to do it that is the right way, look very neat. - What size are the unirac bolts and what size was the rafter?

@The Solar King, are you prepared to state that that won't give problems over th enext 25 years? as Biggs says 'Ouch'

 

OP

J

jerriais

• Oct 21, 2011

• #7

I've seen a draft of a new version of the DTi guide and it specifically states that hanger bolts are not recommended apart from on metal roofs or when the slates are large and very thick older stone slates. I think we will all be flashing soon (in a manner of speaking). That's fine for us as that has been our policy from day one, I just think it lessens the risk of expensive call outs later so it makes business sense now even if it takes a bit longer to install. Also quality work builds reputation and when the FITs are reduced, reputation will be one of the key issues that determines who sinks and who swims.

 

OP

P

powervan

• Oct 21, 2011

• #8

Julian (very neat) the house next door just have hanger bolts drilled straight through tiles and silicone then rubber cap tight to slate!! bound to crack slate! what length hanger bolts are they? schuco M10x110? thanks lads for info!!

 

OP

P

powervan

• Oct 21, 2011

• #9

julian can u point me in right direction for flashing item ie cat number?

 

OP

J

JulianC

• Oct 21, 2011

• #10

Afternoon all. For the UniRac system, Dulas' part number for the flashing is SSFSM990103 (Unirac's number 990103) - the sheet is 18" x 18" but for the job above we were able to fold the excess under to make it look a bit neater. The stand-off that pokes up through the flashing is part no. SSFSM004400C. The bolts that hold the L-bracket to the top of the stand off are supplied with the kit and are 3/8 UNC x 3/4" (it's a US system!)

The stand-offs have a flanged base with two mounting bolt holes - we use 8 x 80mm Spax screws. Rafters on this particular job were 3x2 and we added some strengthening noggins between rafters on the recommendation of our structural survey.

 

OP

P

powervan

• Oct 21, 2011

• #11

this is got to be the answer?

 

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OP

P

powervan

• Oct 21, 2011

• #12

found it all (its the dogs doooo darrrrs i will sleep easy tonite!!! thanks

 

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J

JulianC

• Oct 21, 2011

• #13

Looks like one of the other Unirac stand-offs from their range. Same system - screw the post to the rafter and fit the flashing tile over the top. Works a treat.

 

Worcester

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• Oct 21, 2011

• #14

@JulianC, you can pm me if you like. What is the typical cost of one of those mounting posts, when you take a basic roof hook, add in the lead, and the time of a good lead capable roofer they aren't cheap, so they could be cost effective.

 

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P

powervan

• Oct 21, 2011

• #15

respected member price is £174.74 for unirac 2 piece standoff pack 24
£103.40 pack of 12 flashing
bit costly but if it works then i have no prob (FIT AND FORGET)