How do I stop damp in my brick shed?

Use a liquid damp-proof membrane or tanking slurry, which if applied correctly would prevent damp from reaching the internal side of the concrete and brick.

diy.stackexchange.com - Damp proofing a single-skin outbuilding for batten & insulation

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I have a small outbuilding (~2m x 4.5m) which I currently use for storing tools and my bicycle. It's a semi-detached single-skin construction with a concrete roof, concrete floor and single-skin brick for the walls. The roof is currently leaking, which means the inside is currently quite humid, but I intend on getting this felted over once the current Covid-19 restrictions have been lifted in the UK. As a result of this humidity, some of my tools have gone rusty and some of my wood scraps have gone mouldy. Later on this year once the roof is fixed I intend to try and convert this space into a small workshop for woodwork and electronics. As part of this, I intend on battening the walls and using 25mm insulation board (with aluminium covering, likely Kingspan TP10), trying to insulate as best as I can while remaining mindful that I don't have much space to play with. I'm confident enough to carry all the woodwork, including replacing the door frame, but I'm not sure how I should go about damp-proofing the interior to protect the battens and plasterboard. Other than the leaky roof I don't believe there is a damp problem elsewhere, the paint I applied the to the bricks two years ago still seems in good condition and not mouldy or flaky. Ventilation isn't an issue as there is a window that I usually leave partially open on night-vent.

To my knowledge my options are to either:

Use a liquid damp-proof membrane or tanking slurry, which if applied correctly would prevent damp from reaching the internal side of the concrete and brick

or

Apply a damp proof membrane along the floor and walls. However this still has the potential of allowing water to pool between the membrane and the brick/concrete.

What would be the best way for a DIY'er like myself, taking into account cost and ease of application?

Here's a proposed layout, showing the issue with the battens when damp proofing is not used.

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Are best sheds Australian made?

We manufacture our sheds in Port Kembla Australia, and all our sheds come with a 20year Manufacturers Warranty. We don't outsource our manufacturing and we manufacture right here in Australia.

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We are a family-owned business who pride ourselves on price, quality and customer service with a combined 150+ years experience in the shed industry from which we have the passion, knowledge and expertise to achieve your desired outcome. At Best Sheds we understand that price is important and we have designed our business with that in mind, allowing us to pass the big saving onto our customers. We take great pride in providing excellent customer service. We understand that whether you’re purchasing a shed that’s big or small, you’re making a significant investment. As a result, you want to know that you can trust the team you’re buying it from.