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How to build a wooden shed?

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How to build a wooden shed?

Hi all, I am about to build a small wooden garden storage shed (3m wide x 2.4m deep) on a gravel base. I have been soaking up tutorials, reading the various excellent posts on this forum and on wooden framing and feel fairly confident about most stages but there are a few grey areas that I would love the community guidance on (and will likely lean on you for tips along the way!).


I previously prepped the ground and laid a gravel pad. The plan is to put 2 x 6 treated joists directly into TuffBlocks as the base of the shed and build on top of that.


So my questions are:



1. I am looking at treated yellow tongue STRUCAflor is this suitable or is there a better alternative? Treated plywood looks very expensive but I don't mind paying if it means increased longevity.

2. Silly question, but given the fact an exposed tongue in these boards will be at one edge of the shed. Do you just cut these off or just fill the gap with sealant?



1. What options do I have for external wooden wall panels? I would like something that looks nicer than particleboard or OSB. Is there an outdoor option of these slotted panels? I guess I could use weatherboards but curious at alternatives.

2. Should I use building wrap?



1. What are my options here? Just colourbond sheets? If yes, should I still put a plywood/OSB roof on and apply the colourbond to that or just attach it straight to the rafters? I assume I would have lots of gaps if I attach directly to the rafters.

2. If colourbond is the way to go, I'm curious to know what you use so that you don't just have sharp raw edges and what to use for the apex of a pitched roof?



I'm going to use screws instead of nails for framing (Personal preference, if I had a nailgun it might be different πŸ˜„). So I don't want to have to pre-drill or anything. What gauge is best, 12g? or thicker? Something like these Buildex RapidDrive Treated Pine Screws 12g x 75mm?


I think that's all I need to know at the moment, once I have these answers I can make my materials order and get stuck in!


Thanks so much

Re: General wooden shed build questions

@Dave-1 I Just looked at the materials list on my plans, and it calls for "roofing felt" and "asphalt shingles". I just assumed they weren't used here due to excessive heat but it looks like you can get them no problem. Ha, I really wish there weren't so many options πŸ˜΅β€πŸ’«


A cladding question for everyone: Are there any major downsides to using a basic pine weatherboard? It seems like a cheap option but I've not figured out how many of them I'd need so perhaps not!

Bunnings Team Member
Bunnings Team Member

Re: How to build a wooden shed?

Hi @Dave-1,

Using pine weatherboards for cladding is cost-effective but comes with downsides. Pine is less durable than fibre-cement, requiring regular maintenance like painting, sealing, and cleaning to prevent issues such as decay and insect damage. Vulnerability to insects, expansion, and contraction, along with the need for frequent inspections, are considerations. 


Long-term maintenance needs and durability are the major downsides, and you'd need to be prepared for yearly oiling and to ensure that insect damage doesn't occur as it doesn't have any pesticide treatments.




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Re: How to build a wooden shed?

@MitchellMc excellent points on the downsides of pine weatherboards. Are these issues less prevalent with some of the fancier James Hardie/Weathertex weatherboards? (I can't afford to use them, just curious!)

I see that each sheet weighs 12kg, I was planning to use the cladding on the door, do you think that would make the door too heavy?


Couple more Qs:


1. Are there options for an off-the-shelf shed window?

2. With the TuffBlocks, the website says I need 21 of them for my footprint! But I've seen people literally use one on each corner. What would you suggest was a sensible amount of them to have?



Re: How to build a wooden shed?

The James Hardie weatherboards are cement sheeting @mikebarker, so they aren't susceptible to the same issues as timber is. You could use them on the door; just ensure you have adequate hinges for the weight. Instead of two, you might like to put four. When an adequate number of hinges are used, there will be no issue with weight and opening and closing the door.


For windows, you might like to consider the STILLA Garden Shed Accessory Cedar Opening Window or STILLA Painted Shed ACC Additional Opening Window, but there is no reason you can't use a window kit for a home.


The number of TuffBlocks or foundations you need is directly related to the calibre of the timber you use and its span capabilities. Say you used 90 x 45mm, you'd need a support every 1000mm. But, if you went with 140 x 45mm, you could push that to around 1500mm. To have one in each corner for a 3000mm wide shed sounds a bit off. You'd need to be using some excessively large timber to be able to achieve that. 21 for your sized shed sounds about right. The only way to reduce that number is to increase the calibre of your timber.




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Re: How to build a wooden shed?

Ok great! That all makes sense. I will be using 140x45mm floor joists and will make sure I have plenty of TuffBlocks in place.


Re: How to build a wooden shed?

@MitchellMc Regarding flashing for the corrugated panels. I understand how to use these on the angled sides but on the sides where water will be running off, I can't put flashing on these as the water can't run off, so other than leaving it bare, what options do I have? I've been trying to see examples and it's either bare feeds into a gutter. I'm just hoping for something neater than a bare, sharp edge but maybe I'm being too picky!


And I'm still unsure of the solution to prevent bugs etc getting in the gaps under the corrugation on that side.


Thanks for fielding my endless questions πŸ˜…

flashing options.png

Home Improvement Guru

Re: How to build a wooden shed?

Afternoon @mikebarker 

Isnt that where you would install a fascia and a gutter?

Flashing would come down and over the edge then fold back underneath the fascia and the gutter would be attached to the fascia? (If you are going to install a gutter otherwise a drip edge will also work.


As for the bugs getting in along a corrugated edge how about something like this Suntuf Black Corrugated Foam Infill - 4 pack to stop the bugs getting in.



Re: How to build a wooden shed?

Afternoon @Dave-1 

There will be a facia board but the plans I have just had OSB and asphalt shingles fully to the edge with no gutter. I can install a gutter but wasn't planning to, the amount of falling leaves etc will be massive so I'll need to cover the gutters etc 


Drip edge sounds good, will look into what that is and where to get them, and those infills look ideal.



Re: How to build a wooden shed?

Hi @mikebarker,


You could use a C channel pop-riveted into the sheeting to cover your exposed edge. That would provide a neat finish.


@Dave-1 has mentioned you can use corrugated foam infill between the sheets and your timber. When the sheets are screwed down, it compresses the foam and fills the gaps. 




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Re: How to build a wooden shed?

Hello all! I decided to design the shed myself to account for differences in roofing etc, plus good fun learning some new software.

I think the design is mostly good (But suggestions absolutely welcomed) but I'm still unsure what to do about the gaps that occur with the overhang. It would be fiddly to try and get something in there. I guess I could do away with the overhang, but that'll be handy in keeping rain off the door.


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