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4 posts

Wannabe Geek


Topic # 247930 3-Mar-2019 12:41
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Hi,

 

I'm looking to replace most of the boards on a large wooden car deck on a sloping section. 90% is made up of 200x50mm boards with quite a few dry and cracking and not safe for a car.

 

At the moment my plan is to start from the worst and start gradually replacing with the same size boards. The deck is on poles with adequate bracing that looks structurally sound. So question is, do I actually need structural H3.2 for this, or could I use H4 boards of the same size (appears to be much cheaper and am I right in thinking will be less impacted by the wet and then dry?)

 

 

 

Second question is am I doing the right thing by replacing them with the same size board? It's hard and expensive to get anything thicker with that width, probably because of the weight and practicality. Is there benefit in going smaller, say twice as much 100x50? Or should I be going to a bigger extreme and looking at 100x75?

 

 

 

Thanks in advance for the help.


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Ultimate Geek
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  Reply # 2190243 3-Mar-2019 12:43
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Are the H4 boards the same structural rating?




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Wannabe Geek


  Reply # 2190259 3-Mar-2019 13:35
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Hmmm, says F2. Which from what I can see is not load bearing? No good?

 
 
 
 


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  Reply # 2190312 3-Mar-2019 15:44
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Designing wooden car decks is outside of the scope of the building codes. So it actually requires engineering design.

Definitely dont modify the design without consulting with an engineer. Especially as a car deck has to be able to withstand very large point loads (weight of car on only 4 tyres). Which is much more difficult to design for, than the same weight but evenly spread out (deck with lots of people on it).

The use of the 200 X 50 would have been done to help withstand the point loads.





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Ultimate Geek
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  Reply # 2190317 3-Mar-2019 15:49
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Can't find a relevant reference to F2 grade.




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Wannabe Geek


  Reply # 2190331 3-Mar-2019 16:23
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Thanks,

I will stick with original sizes then and to be safe go for the machine gauged sg8 H3.2. Sounds like that will be way safer in regards to flexing

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  Reply # 2190343 3-Mar-2019 17:10
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Are you buying from a retail store like M10/Bunnings or a timber yard? You can get SG8 rough sawn H4. What you already have is probably the grade used for retaining walls.



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Wannabe Geek


  Reply # 2190359 3-Mar-2019 17:47
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Mitre 10 most likely as I found out I can now pay with airpoints. Also, gonna be squeezing it into my wagon so will buying in small quantities at a time and cut to length so I'll probably just annoy a timber yard!

Hard to find the 200x50 in H4 and sg8, looks like they only do the small widths and have a feeling that will be to order so will see if they keep the h3.2 sg8 in that size in stock and go from there.

Thanks for your help guys

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  Reply # 2190364 3-Mar-2019 18:19
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H3.2 cca is the standard treatment for above ground use, h4 is ground contact.The size you will ask for is 19045 kd. Since kd treatment went from 3.1 losp treatment to 3.2 cca, wet wood is not preferred as much these days due to movement as it drys.

 

But as Aredwood has mentioned I wouldn't be doing any alterations without professional advice.


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  Reply # 2190378 3-Mar-2019 18:31
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There is so little difference in price between wet and kiln dried H3.2 SG8 it makes sense to use kiln dried as its easier to work with and won't shrink so much. However it will expand a little, but it won't change as much in size as the wet timber. They should stock wet in the standard lengths, and the dry in a smaller range of lengths.

 

As dazhann  says, 19045 is 200mm x 50mm gauged (or planed/dressed) down to 190mm x 45mm.

 

Did you know that when the retailer buys the timber in bulk, they pay for the undressed or rough sawn volume. As someone explained to me, they are charged for the sawdust but never receive it!

 

 

 

 

 

 

 

 


neb

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  Reply # 2190484 4-Mar-2019 00:22
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Aredwood: Definitely dont modify the design without consulting with an engineer. Especially as a car deck has to be able to withstand very large point loads (weight of car on only 4 tyres).

 

 

Also, from a regulatory code point of view, the building codes assume you'll be parking a 3 ton Remuera tractor on whatever it is you want to build even if it's just a little two-door hatchback. So overbuilding is practically mandatory if you don't want the council to ding you for it.

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