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I've got a new shed being put up this weekend, I want to try to seal it up to keep some of the bugs from taking over. After looking around Focus DIY (large DIY chain in the UK) I found some "wood sealer", which comes in a tube and slots into a gun for squeezing out.
Each tube costs £6 and I think I'd need about 20 or so in order to seal a 6' by 8' shed, is there a cheaper or more effective method?
Just lay some tongue-and-groove OSB plywood on top of the planks.
For a 6x8 shed, you should only need two 4x8 sheets - which should certainly cost a lot less than the £120 you would pay for sealer.
Or for that matter, just have them use T&G plywood for the flooring in the first place.
Because a shed is generally subjected to temperature extremes you need to consider that its floor is prone to expansion and contraction. You therefore need to allow for some movement and whatever you use to fill the gaps needs to remain at least slightly flexible. Something I haven't tied myself but think might work is the dense foam rubber strips that are used in some places for expansion joints in concrete, if your gaps are large enough to accommodate them. Failing that I'd suggest a caulk that develops a semi-hard skin.
You can seal any gaps with expanding foam spray. Just be sure to wear disposable gloves while applying.
I tried foam spray to fill gaps in my kitchen cabinet under the sink. It kept out the mice but looked bumpy and messy.
