Workshop
Start a discussion

The Bunnings Workshop community can help with your home improvement projects.

Planning and building a deck for alfresco

shawnvaz
Budding Contributor

Planning and building a deck for alfresco

Hi Team,

 

I am in the process of building a deck in my alfresco. 

i would like to clarify, is it ok for me to build it this way?

the spacing in the picture is not correct. i was thinking 400 MM between each wood and then the deck boards go on top of it?

will this work? or should the base frame be above the ground? I.e not touching the floor?

 

shawnvaz_0-1636269694220.png

 

 

Thanks a lot

MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: planning and building a deck

Hi @shawnvaz,

 

Spacing your joists 400mm apart would be fine to lay the decking upon. It's best to have the joists elevated above the ground to allow airflow to the structure and water to runoff. You could use the brackets you have now and elevate the joists 10mm off the ground. That would be much better than having them sitting directly on the ground. You might like to use some Macsim 75mm Mixed Hang Window Packers to assist in getting the correct height.

 

Please let me know if you have further questions.

 

Mitchell

 

 

See something interesting? Give it the thumbs up!
Reply
Loading...
shawnvaz
Budding Contributor

Re: planning and building a deck

@MitchellMc 

 

Thanks a lot for sharing.

what is the span between each bracket? i am using 90x45 timber. 

also, what is the gap between each timber? like i mentioned before 400mm is ok or can i extend to 450/500mmm?

 

How can i draw a plan? is there something i can use to draw up a plan so i know where each item should be placed and how many of each material i require?

 

Thanks a lot

 

Shawn 

Reply
Loading...
EricL
Bunnings Team Member
Bunnings Team Member

Re: planning and building a deck

Hello @shawnvaz

 

The span of each bracket is relative to the length of your timber. The more brackets you have, the more support the timber has and therefore eliminates the possibility of having a bouncy frame. As my colleague @MitchellMc has mentioned having a space of 400mm for your joist is fine. If the area supports a 450mm distance, that spacing will work as well. I suggest having a look at this discussion - Low-level deck advice and suggestions by @oninpena. Their build area is very similar to yours and you might find some of our recommendations applicable to your plan.  

 

There are many types of software you can use from Sketchup to Tinkercad. There are also online estimators that you can use to get an idea of how to lay your frame. I suggest drawing it with traditional pen and paper as it gives you a much better idea of how you will build the frame. You can also put side notes and reminders to yourself while planning the frame. I recommend having a look at this guide - How to build a low-level deck by @Adam_W. This guide will give you basic ideas of how to draw your frame. Once you finish your framing plan post it here. Our members can then have a look at it and make recommendations that will help you out.

 

Here is a link for ideas and inspiration: Inspiring low-level deck builds

 

Here are some amazing low-level decks that our Workshop members have shared.

 

 

Please keep us updated with your progress, we look forward to seeing your deck framing plan. 

 

If you need further assistance, please let us know.

 

Eric

 

See something interesting? Give it the thumbs up!
Reply
Loading...
shawnvaz
Budding Contributor

Re: planning and building a deck

@EricL @MitchellMc 

 

Excellent information

thanks a lot for sharing. 

 

next question.

1. How do I make the frame. ie how do I screw everything together? do I use nails or screws? i am using 90x45 timber. when it comes to the edge which part should I overlap?

2. should i use joist hangers or just screw/nail the timber to the outer frame?

3. can i have brackets for the support at 500mm apart? i.e for a 4-meter length of joist I will have 8 brackets. is this too much? i want to avoid having to drill too many holes on my concrete slab.

4. if i do not have a 4-meter long piece of wood, can i use a 3m and 1 meter? how do i join them? do i need to have a special join or just place 2 brackets on the end of each wood piece where they join?

Reply
Loading...
MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: planning and building a deck

Hi @shawnvaz,

 

To fix the frame together, you can use Zenith 14 - 10 x 100mm Galvanised Type 17 Batten Bugle Head Timber Screws. You can also use them to join your joists to the frame. Joist hangers are convenient and might be needed if the frame is hard up against a wall and you can't screw through the frame into the end of the joists.

 

Joist supports don't need to be as close together as 500mm. If you look at a few of the projects contributed by our members, they tend to include supports spaced up to around the 1000mm mark.

 

You could join two sections of timber with brackets, and you don't need to create a special join if each section of timber is adequately supported. It would be a good idea to plan your joist supports out, so one is right next to the join.

 

Mitchell

 

See something interesting? Give it the thumbs up!
Reply
Loading...
shawnvaz
Budding Contributor

Re: planning and building a deck

@MitchellMc 

 

Thanks a lot. Please forgive my drawing, i am no expert

im sorry, let me correct myself

i am using a 90x35 timer. will this work ok?

 

I am trying to deck the alfresco area. but extend the deck a bit over

 

shawnvaz_0-1636715213645.png

 

this is the area i am planning to deck

shawnvaz_2-1636715664804.png

 

request :

1. for 90x35 , what bracket should i use. (reminder i am building low profile deck. 130 mm from the concrete slab)

2. what spacer can i use?

3. towards the end of the deck i have a 70 mm fall. so there is an excessive gap. what can i use in this space? is there a bracket that can support it?

4. what should i use for bracket and bolt. (Eg. bracket, bolt to screw into concrete and bolt/screw for bracket to timber)

 

below is the pattern i am aiming

 

shawnvaz_3-1636716135211.png

 

Thanks
Shawn 

Reply
Loading...
EricL
Bunnings Team Member
Bunnings Team Member

Re: planning and building a deck

HI @shawnvaz

 

Thank you for updating us with your plan. Doing some quick math 130mm ( available space ) - 90mm ( timber frame ) - 19mm ( deck panel thickness ) will leave us with a 21mm gap. I suggest using Dunnings 40 x 80 x 40 x 5mm M12 Galvanised Angle Bracket. However, if you have an increasing fall you might have to use the next size up when you get to the center of your deck.

 

When you get to the end of your deck where the gap is 200mm I suggest using Dunnings 65 x 130 x 65 x 5mm M12 Galvanised Angle Bracket. To anchor the angle bracket to the concrete, I suggest using Dynabolt Galvanized. To mount the timber to the angel bracket, I recommend Bolt and Nut Galvanized in conjunction with Washer Galvanized. The size of the bolts, nuts, and washer you will use is based on the thickness of the angle bracket and the timber framing.

 

You will have to use a combination of timber offcuts and Macsim Fasteners 75mm Assorted Window Packers - 90 Pack. Let me tag my colleague @MitchellMc and see if he has other ideas on what bracket to use for your deck.

 

If you need further assistance, please let us know.

 

Eric

 

See something interesting? Give it the thumbs up!
Reply
Loading...
MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: planning and building a deck

Hi @shawnvaz,

 

I trust @EricL's recommendations are useful, and I'd agree with what he's suggested.  You'll have a little bit of room to work with the brackets on the sloped section. The brackets can be mounted at different heights onto your 90 x 35mm timber. I'll illustrate below. If the gap becomes too large, you'll need to switch to the larger bracket that Eric mentions.

 

90 x 35mm timber will work, but my preference would be to use 90 x 45mm timber as the deck will be stronger and more rigid.

 

Please let us know if you have more questions or need further assistance.

 

Mitchell

 

ang1.pngang2.png

See something interesting? Give it the thumbs up!
Reply
Loading...
shawnvaz
Budding Contributor

Re: planning and building a deck

Thanks  @MitchellMc 

 

Unfortunately, i have already purchased the 90x35. i guess ill have to stick to it. 

for the bracket. do i need to have 2 dynabolts? or one is sufficient?

can i use a threaded screw instead?

i heard bolts will cause the concrete to crack due to expansion, especially towards the end of the perimeter.

Reply
Loading...

Why join the Bunnings Workshop community?

Workshop is a friendly place to learn, get ideas and find inspiration for your home improvement projects