Roof Trusses

[Shultzy]

I've assumed that as most roof trusses are made with structural nail plates they would be ok. An architect friend of mine has said that the truss config is ok for the span.

 

[SketchUp Guru]

I realized the roof has bit of slope to it. I'd still go with the manufactured floor joists for ease of construction and space for insulation and wiring.

 

[JFC]

Oh well if an Architect has done the stress and loading calculations and specified the nail plate size then it must be ok .
You didn't mention you had a pro look at the plans in your first post .

 

[Shultzy]

JFC - Ah - sorry, thats because my post was about putting nail plates on with a nailer and not truss design.

 

[JFC]

My mistake then .
Funny he didnt mention what fixings to use in his spec as the fixings would be 99.9%of holding the whole thing together .

 

[Shultzy]

JFC - When I asked him about the joints he said "use nail plates, they are the easiest to fix" . I wasn't sure if I could use a nail gun (which I haven't got yet)
Les chicken suggested it wasn't a good idea to used a gun as it could be dangerous. So I think I'll either use flat head nails and nailplates, or glued cleats and a nailgun.

 

[mailee]

Shultzy, not trying to be a killjoy but I would go with Mel on this one with the beams and firings, much simpler to make for a fall roof. Why complicate matters more? Just add some suspended beams below to carry your timber offcuts. IMHO. :wink:

 

[mel]

shultzy
ive been searching for a picture of what i concieve as a nail plate
and came across this

http://cnhuantai.en.alibaba.com/product ... late_.html

is this what your going to use ???

these fixings are pressed in with a hydraulic press :?
or you may be able to hammer them in if the band is not too wide

if you have a scaffold yard near you that services its own equipment, they will have some of them , around 30mm wide and 180mm long

they are used on scaffold boards to stop the ends splitting

or am i off on the wrong tangent :?:

 

[Shultzy]

mel and john - These are the nailplates I was going to use

http://www.wickes.co.uk/invt/246003

 

[mel]

ok shultzy
now im with you
les is correct , far to dodgy trying to line up nails with a nail gun , so if you decide to go down this route you have a lot of nailing to do
if you insist on doing it this way then your better off with the ply gussets and wood glue, as mentioned earlier
good luck with the build
keep us up to date
mel

 

[Shultzy]

mel and john - Thanks for all your comments. I will post the building of my workshop when I start it in the spring. I'm still preparing the ground for the base. I've been working on the design and quantities on and off since I retired in april. Hopefully I'm getting close to costing it out, including any new tools I need to construct it.

 

[Anonymous]

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[Shultzy]

Mr_Grimsdale - I looked up the size for a span of 8' @ 24" centres and it is 8"x2".

6deg is about 1 1/4" to the foot whereas a flat roof is usually 1/4" to the foot.

 

[Jake]

Is that as a floor joist rather than a rafter, though?

 

[Flyer]

Hi,

I built my aircraft hangar with a 40 foot span and used wooden gussets, nails and glue. It has faired well for 25 years and withstood 150 km/hour winds.

Ray

 

[Keith Smith]

Mr_Grimsdale - I looked up the size for a span of 8' @ 24" centres and it is 8"x2".

6deg is about 1 1/4" to the foot whereas a flat roof is usually 1/4" to the foot.

The rule of thumb for this, and it errs on the safe side, is half the width plus two for joist size in inches. So for an 8ft wide span 4+2=6, so 6x2 beam, but yours is 8ft 8" so the convention is to go to the next size up hence 8x2.