Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


mnmsymmons

4 posts

Wannabe Geek


#247930 3-Mar-2019 12:41
Send private message

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.


Create new topic
wally22
447 posts

Ultimate Geek

Trusted
Lifetime subscriber

  #2190243 3-Mar-2019 12:43
Send private message

Are the H4 boards the same structural rating?


Affiliate link
 
 
 

Affiliate link: NordVPN allows you to securely access the Internet, encrypt your connection and keep your browsing history private.
mnmsymmons

4 posts

Wannabe Geek


  #2190259 3-Mar-2019 13:35
Send private message

Hmmm, says F2. Which from what I can see is not load bearing? No good?

Aredwood
3885 posts

Uber Geek


  #2190312 3-Mar-2019 15:44

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.







wally22
447 posts

Ultimate Geek

Trusted
Lifetime subscriber

  #2190317 3-Mar-2019 15:49
Send private message

Can't find a relevant reference to F2 grade.


mnmsymmons

4 posts

Wannabe Geek


  #2190331 3-Mar-2019 16:23
Send private message

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

Bung
4626 posts

Uber Geek


  #2190343 3-Mar-2019 17:10
Send private message

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.

mnmsymmons

4 posts

Wannabe Geek


  #2190359 3-Mar-2019 17:47
Send private message

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



dazhann
459 posts

Ultimate Geek


  #2190364 3-Mar-2019 18:19
Send private message

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.


wally22
447 posts

Ultimate Geek

Trusted
Lifetime subscriber

  #2190378 3-Mar-2019 18:31
Send private message

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

neb
6572 posts

Uber Geek

Trusted
Lifetime subscriber

  #2190484 4-Mar-2019 00:22
Send private message

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.

Create new topic





News and reviews »

Belkin Screenforce Tempered Glass Screen Protector and Bumper - Apple Watch
Posted 15-Aug-2022 17:20


Samsung Introducing Galaxy Z Flip4 and Galaxy Z Fold4
Posted 11-Aug-2022 01:00


Samsung Unveils Health Innovations with Galaxy Watch5 and Galaxy Watch5 Pro
Posted 11-Aug-2022 01:00


Google Bringing First Cloud Region to Aotearoa New Zealand
Posted 10-Aug-2022 08:51


ANZ To Move to FIS Modern Banking Platform
Posted 10-Aug-2022 08:28


GoPro Hero10 Black Review
Posted 8-Aug-2022 17:41


Amazon to Acquire iRobot
Posted 6-Aug-2022 11:41


Samsung x LIFE Picture Collection Brings Iconic Moments in History to The Frame
Posted 4-Aug-2022 17:04


Norton Consumer Cyber Safety Pulse Report: Phishing for New Bait on Social Media
Posted 4-Aug-2022 16:50


Microsoft Announces New Solutions for Threat Intelligence and Attack Surface Management
Posted 3-Aug-2022 21:54


Seagate Addresses Hyperscale Workloads with Enterprise-Class Nytro SSDs
Posted 3-Aug-2022 21:50


Visa Launching Eco-friendly Payment Solutions in New Zealand
Posted 3-Aug-2022 21:48


NCR Delivers Services to Run Bank of New Zealand ATM Network
Posted 30-Jul-2022 11:06


New HP Portfolio Supports New Era of Hybrid Work
Posted 28-Jul-2022 17:14


Harman Kardon Launches Citation MultiBeam 1100 Soundbar
Posted 28-Jul-2022 17:10









Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.







GoodSync is the easiest file sync and backup for Windows and Mac