Screws for fixing corrugated asbestos to timber joists?

[Al Shahadie]

Good day...

Can anyone advise me on the type of screws to use for fixing down
corrugated asbestos to timber roof joists? The asbestos has large 'waves'
(approx 5" from peak to peak). I'd like the job to last 30 years or more.
I live in an are where gale-force winds are common. Should I use stainless
steel? What thickness should they be and how far should they penetrate the
timber? I'm thinking that something with a hexagonal head would make more
sense that a pozi-drive head. Would you agree? What kind of rain-proof
washers should I use?

Anyone suggest an online source?

Aside from stainless, in Jewsons, I've seen some green-coated hex-headed
screws designed for timber decking, but I'm not sure how rust-proof they
really are.



Many thanks,

A

[Nick Odell]

What's this then? A covered bridge? Trip-trap. Trip-trap.

Nick

[The Other Mike]

On 9 Oct 2012 09:39:00 GMT, Al Shahadie <bd...@fdffgdf.net> wrote:

>Aside from stainless, in Jewsons, I've seen some green-coated hex-headed
>screws designed for timber decking, but I'm not sure how rust-proof they
>really are.

In my experience after about five years outdoors the 'green' coated coach bolts
that Screwfix and Wickes sell are holding up very well. Zero visible
degradation anywhere.

--

[meow...@care2.com]

Real asbestos lasts much beyond 30yrs, modern equivalents probably will too. So I'd go stainless, with a plastic washer - rubber tends not to last that long. Also put the screws through the peaks, not the troughs, to minimise water ingress and help direct what does get in away from the timber.


NT

[Tim Lamb]

In message <f5f99f4f-d044-4f23...@googlegroups.com>,
meow...@care2.com writes

Google TEK screws and filter with fibre cement sheet fixings.

You seem to have a 130mm pitch sheet which is 36mm high. Purlins should
be 1275 max. apart.

You can easily get coloured plastic caps to fit over the exposed hex
screw head. There should be a variant with a pre-fitted neoprene washer
to seal the hole in the sheet ridge.

--
Tim Lamb

[Kipper at sea]

On Tuesday, October 9, 2012 10:39:00 AM UTC+1, Al Shahadie wrote:

> Good day... Can anyone advise me on the type of screws to use for fixing down corrugated asbestos to timber roof joists? The asbestos has large 'waves' (approx 5" from peak to peak). I'd like the job to last 30 years or more. I live in an are where gale-force winds are common. Should I use stainless steel? What thickness should they be and how far should they penetrate the timber? I'm thinking that something with a hexagonal head would make more sense that a pozi-drive head. Would you agree? What kind of rain-proof washers should I use? Anyone suggest an online source? Aside from stainless, in Jewsons, I've seen some green-coated hex-headed screws designed for timber decking, but I'm not sure how rust-proof they really are. Many thanks, A

6" galvernised drive screws with a spat washer for big six .

[harry]

There are special screws (and nails) with square curved washers made
for the purpose. They go into the crest of the sheets BTW
You will get them from where ever the sheet came from.
BTW I hope it is not asbestos. Fitting asbestos is not good.
If they are new the will be fibre cement not asbestos cement.

[meow...@care2.com]

glass fibre rather than asbestos fibre. Asbestos cement sheet's ok if its not disintegrating.


NT

[Al Shahadie]

harry <harry...@btinternet.com> wrote in news:bc1d6e72-9f4a-4a09-8b83-
6a0db0...@s14g2000vba.googlegroups.com:

> There are special screws (and nails) with square curved washers made
> for the purpose. They go into the crest of the sheets BTW
> You will get them from where ever the sheet came from.
> BTW I hope it is not asbestos. Fitting asbestos is not good.
> If they are new the will be fibre cement not asbestos cement.

Thanks; the asbestos roof has existed for many years. I am just reinforcing
it. Thanks for the info on the diamond curved washers.

A

[Al Shahadie]

Kipper at sea <keith...@ntlworld.com> wrote in
news:a7a731d0-3810-4161...@googlegroups.com:

> 6" galvernised drive screws with a spat washer for big six .

Thank you. Those terms are helping me seach out suitable items.
A

[Al Shahadie]

meow...@care2.com wrote in
news:f5f99f4f-d044-4f23...@googlegroups.com:

> Real asbestos lasts much beyond 30yrs, modern equivalents probably
> will too. So I'd go stainless, with a plastic washer

Thanks.. Yes, my fist inclination was to go for the plastic washers... But
then, I remembered how short-lived many plastics can be when exposed to
sunlight. For example, I bought a plastic sprinkler hose for my garden last
spring, (which I assumed would be made of a plastic fit for purpose) and by
the end of one summer, it turned so brittle that it broke whenever flexed.

Yes, rubber is of course subject to perishing. I think neoprene lasts much
longer outdoors, doesn't it?

A

[Al Shahadie]

Tim Lamb <t...@marfordfarm.demon.co.uk> wrote in
news:waRizbG6...@marfordfarm.demon.co.uk:

> Google TEK screws and filter with fibre cement sheet fixings.
>
> You seem to have a 130mm pitch sheet which is 36mm high. Purlins should
> be 1275 max. apart.
>
> You can easily get coloured plastic caps to fit over the exposed hex
> screw head. There should be a variant with a pre-fitted neoprene washer
> to seal the hole in the sheet ridge.

That is helpful - thank you.
Thanks also to the other responees.

A

[Al Shahadie]

Tim Lamb <t...@marfordfarm.demon.co.uk> wrote in
news:waRizbG6...@marfordfarm.demon.co.uk:

> You seem to have a 130mm pitch sheet which is 36mm high. Purlins should
> be 1275 max. apart.

I just went and checked; The ridges are 6" from peak to peak, and the
height is 2"..

Thanks,
A

[Tim Lamb]

In message <XnsA0E86D837ED7E...@130.133.4.11>, Al Shahadie
<bd...@fdffgdf.net> writes

Ah! In that case search on *big six roof sheeting*. You will need 100mm
fixings.

--
Tim Lamb

[Al Shahadie]

Tim Lamb <t...@marfordfarm.demon.co.uk> wrote in

news:liKnNJSU...@marfordfarm.demon.co.uk:

>>I just went and checked; The ridges are 6" from peak to peak, and the
>>height is 2"..
>
> Ah! In that case search on *big six roof sheeting*. You will need 100mm
> fixings.

Thanks. 'Kipper' suggests 6" somewhere in this thread. Perhaps somewhere
between 4" and 6" will do, depending on how many of the things I am
prepared to buy (and screw in), per sheet... At least the asbestos has some
weight to it, which I guess reduces the chance of it lifting off in a
storm.

A

[meow...@care2.com]

On Wednesday, October 10, 2012 10:37:06 AM UTC+1, Al Shahadie wrote:
> meow2222 wrote in

>
> news:f5f99f4f-d044-4f23...@googlegroups.com:
>
>
>
> > Real asbestos lasts much beyond 30yrs, modern equivalents probably
>
> > will too. So I'd go stainless, with a plastic washer
>
>
>
> Thanks.. Yes, my fist inclination was to go for the plastic washers... But
>
> then, I remembered how short-lived many plastics can be when exposed to
>
> sunlight. For example, I bought a plastic sprinkler hose for my garden last

Some do, some don't.


NT

[Kipper at sea]

On Tuesday, October 9, 2012 10:39:00 AM UTC+1, Al Shahadie wrote:
> Good day... Can anyone advise me on the type of screws to use for fixing down corrugated asbestos to timber roof joists? The asbestos has large 'waves' (approx 5" from peak to peak). I'd like the job to last 30 years or more. I live in an are where gale-force winds are common. Should I use stainless steel? What thickness should they be and how far should they penetrate the timber? I'm thinking that something with a hexagonal head would make more sense that a pozi-drive head. Would you agree? What kind of rain-proof washers should I use? Anyone suggest an online source? Aside from stainless, in Jewsons, I've seen some green-coated hex-headed screws designed for timber decking, but I'm not sure how rust-proof they really are. Many thanks, A

Just to throw a bit more confusion into the subject, there are four types of asbestos or as its known now as fibre cement sheet, Standard three, Big six, Super Six and Trafford Tile. Standard three use 4" drive screws, Big six and Trafford Tile use 6" drive screws and Super Six use 8" drive screws.

[Tim Lamb]

In message <162bc2a3-0516-46fe...@googlegroups.com>,
Kipper at sea <keith...@ntlworld.com> writes

Drive screws are a one way trip unless you care to angle grind the heads
off.

--
Tim Lamb

[Kipper at sea]

On Thursday, October 11, 2012 11:34:47 AM UTC+1, Tim Lamb wrote:
> In message <162bc2a3-0516-46fe...@googlegroups.com>, Kipper at sea <keith...@ntlworld.com> writes >On Tuesday, October 9, 2012 10:39:00 AM UTC+1, Al Shahadie wrote: >> Good day... Can anyone advise me on the type of screws to use for >>fixing down corrugated asbestos to timber roof joists? The asbestos >>has large 'waves' (approx 5" from peak to peak). I'd like the job to >>last 30 years or more. I live in an are where gale-force winds are >>common. Should I use stainless steel? What thickness should they be >>and how far should they penetrate the timber? I'm thinking that >>something with a hexagonal head would make more sense that a >>pozi-drive head. Would you agree? What kind of rain-proof washers >>should I use? Anyone suggest an online source? Aside from stainless, >>in Jewsons, I've seen some green-coated hex-headed screws designed for >>timber decking, but I'm not sure how rust-proof they really are. Many thanks, A > >Just to throw a bit more confusion into the subject, there are four >types of asbestos or as its known now as fibre cement sheet, Standard >three, Big six, Super Six and Trafford Tile. Standard three use 4" >drive screws, Big six and Trafford Tile use 6" drive screws and Super >Six use 8" drive screws. Drive screws are a one way trip unless you care to angle grind the heads off. -- Tim Lamb

The drive screw that were used for fixing on sheets to timber perlins were galv twisted with a point at the bottom and a domed top. the prociger was to drill a 1/4" hoThe drive screw that was used for fixing sheets to timber perlins was galv thick nail with a course twisted sank with a point at the bottom and a domed top. The process was to drill a 1/4" hole through the top of the roll, thread a plastic spat or doughty washer onto the screw, tap the screw through the drilled hole and knock the screw into the timber perlins. The screw twist into the timber as its being driven in. The only way to release the screw is by using a pair of round-jawed mole grips clamped round the head of the screw and turning it anti clockwise. The modern fixing screws are entirely different and come with attach washers and a hexagon headle through the top of the roll, thread a plastic spat or doughty onto the screw, thread the screw through the drilled hole and knock the screw into the timber perlins. The screw twist into the timber as its being driven into the timber. The only way to release the screw is by using a pair of mole grips clamped round the head of the screw and twisting it anti clockwise. The modern fixing screws are entirly different and come with attacht washers and a hexgan head.