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As autumn rolls in, the evenings get cooler and outbuildings like sheds, garages and workshops often become uncomfortably draughty. Cold air sneaks through loose doors, thin walls, cracked windows and roof gaps – making it harder to use your outdoor spaces for storage, DIY or hobbies.
The good news? You don’t need a full rebuild to make a difference. With a few plastic sheets and some easy-to-use fixings, you can dramatically reduce draughts, lock in warmth and protect your outbuilding from autumn’s wind and rain.
In this guide, we’ll show you how to draught-proof sheds, garages and workshops using acrylic, polycarbonate, Foamex and Dibond sheets, along with simple fixings like magnetic strips, tapes and adhesives.
As autumn rolls in, the evenings get cooler and outbuildings like sheds, garages and workshops often become uncomfortably draughty. Cold air sneaks through loose doors, thin walls, cracked windows and roof gaps – making it harder to use your outdoor spaces for storage, DIY or hobbies.
In this guide, we’ll show you how to draught-proof sheds, garages and workshops using acrylic, polycarbonate, Foamex and Dibond sheets, along with simple fixings like magnetic strips, tapes and adhesives.
The good news? You don’t need a full rebuild to make a difference. With a few plastic sheets and some easy-to-use fixings, you can dramatically reduce draughts, lock in warmth and protect your outbuilding from autumn’s wind and rain.
Why Use Plastic Sheets for Draught Proofing?
Plastic sheets are an excellent alternative to traditional materials like wood or glass for autumn repairs. Here’s why:
Lightweight & Easy to Work With – Unlike glass, which is heavy and breakable, plastics like acrylic and Foamex can be cut with basic tools, making them ideal for small DIY projects.
Durable & Weather-Resistant – Acrylic and polycarbonate stand up to autumn’s heavy rain and strong winds much better than wood which swells, or glass which can crack.
Versatile for Different Uses – Clear acrylic for windows, opaque Foamex for wall lining, Dibond for long-lasting roof patches – there’s a plastic sheet to suit every type of draught-proofing job.
Affordable – Plastic sheeting is a cost-effective way to seal gaps, add insulation and strengthen outbuildings without the expense of full renovations.
Plastic sheets offer the ideal combination of practicality and performance, making them a smart choice for preparing your shed, garage or workshop for colder weather.
Where Draughts Come From - and How to Fix Them
Outbuildings let in cold air through a few typical weak spots, but with the right sheet material and accessories, these draughts can be easily reduced or eliminated.
1. Windows: Add Secondary Glazing
Sheds and garages often have old, thin glass panes – or no glass at all. These are one of the biggest sources of heat loss. Adding a layer of secondary glazing makes a huge difference.
Acrylic: Lightweight, crystal clear and affordable. A good choice if your shed isn’t in a high-impact area.
Polycarbonate: Up to 200 times stronger than glass, perfect if your outbuilding is exposed to autumn storms or falling branches.
How to fix it:
Cut your panel to size and mount it inside the window frame. Use magnetic tape for a removable option (great for taking off in summer) or adhesive tape for a more permanent seal. Both are quick, no-tools fixes that Cut Plastic Sheeting supplies.
💡 Pro tip: Leave a small air gap (around 10mm) between the glass and the plastic sheet. This acts as insulation, trapping warmer air inside.
1. Windows: Add Secondary Glazing
Sheds and garages often have old, thin glass panes – or no glass at all. These are one of the biggest sources of heat loss. Adding a layer of secondary glazing makes a huge difference.
Acrylic: Lightweight, crystal clear and affordable. A good choice if your shed isn’t in a high-impact area.
Polycarbonate: Up to 200 times stronger than glass, perfect if your outbuilding is exposed to autumn storms or falling branches.
How to fix it:
Cut your panel to size and mount it inside the window frame. Use magnetic tape for a removable option (great for taking off in summer) or adhesive tape for a more permanent seal. Both are quick, no-tools fixes that Cut Plastic Sheeting supplies.
💡 Pro tip: Leave a small air gap (around 10mm) between the glass and the plastic sheet. This acts as insulation, trapping warmer air inside.
2. Doors: Seal the Gaps
Timber shed doors and garage doors warp and shrink over time, leaving gaps where cold air whistles in.
Cut narrow strips of Foamex or acrylic sheet to cover or line the door edges.
Fix them in place with foam tape or double-sided tape, creating a snug seal.
💡 Pro tip: If you want a temporary seasonal fix, use adhesive strips instead of permanent adhesives – you can remove them when spring comes.
💡 Pro tip: If you want a temporary seasonal fix, use adhesive strips instead of permanent adhesives – you can remove them when spring comes.
2. Doors: Seal the Gaps
Timber shed doors and garage doors warp and shrink over time, leaving gaps where cold air whistles in.
Cut narrow strips of Foamex or acrylic sheet to cover or line the door edges.
Fix them in place with foam tape or double-sided tape, creating a snug seal.
3. Walls: Line Thin or Warped Panels
Many outbuildings are made of thin timber panels that don’t keep out cold air well. You can dramatically improve insulation by adding an internal lining.
Foamex boards are ideal: they’re lightweight, easy to cut and bright white, so they also reflect more light inside your shed or garage.
For a more robust fix, use Dibond (an aluminium composite panel). This adds a strong, weatherproof layer that won’t warp or rot.
How to fix it:
Mount panels using construction adhesive for a smooth finish, or secure with decorative screws if you prefer a stronger, semi-permanent attachment.
4. Roofs: Patch or Replace Panels
Roofs often suffer from loose corrugated sheets, cracked skylights or small holes that let in draughts and rain.
Use polycarbonate sheets for replacing cracked panels or adding skylight covers. They’re UV-resistant and tough enough for outdoor use.
For small patch repairs, Dibond panels can be cut to size and attached with adhesives or screws.
💡 Pro tip: Even small gaps in a roof can let in a surprising amount of cold air – check corners and joins carefully for leaks.
4. Roofs: Patch or Replace Panels
Roofs often suffer from loose corrugated sheets, cracked skylights or small holes that let in draughts and rain.
Use polycarbonate sheets for replacing cracked panels or adding skylight covers. They’re UV-resistant and tough enough for outdoor use.
For small patch repairs, Dibond panels can be cut to size and attached with adhesives or screws.
💡 Pro tip: Even small gaps in a roof can let in a surprising amount of cold air – check corners and joins carefully for leaks.
5. Vents & Gaps: Create Removable Draught Screens
Some ventilation is important, especially in summer when outbuildings get warm. But in autumn, those same vents let in cold air.
Cut removable covers from Foamex or acrylic sheets.
Fix them with magnetic tape so they can be easily added in autumn and taken off when warmer weather returns.
This way you keep your shed draught-proof in autumn and winter, but still allow airflow in summer.
Energy Efficiency & Cost Benefits of Plastic Sheets
Draught-proofing your outbuildings with plastic sheets isn’t just about comfort – it can also save you money and protect your belongings. Here’s how:
Lower energy bills: Sealing gaps and insulating thin walls reduces heat loss, making any heating more efficient.
Protect stored items: Keeps tools, equipment and supplies safe from damp, condensation and rust.
Prevent costly repairs: Weatherproof panels help avoid damage to walls, doors and roofs caused by wind and rain.
Long-lasting investment: Durable plastic sheets like acrylic, polycarbonate, Foamex and Dibond provide a cost-effective, long-term solution for your outbuilding.
Lower energy bills: Sealing gaps and insulating thin walls reduces heat loss, making any heating more efficient.
Protect stored items: Keeps tools, equipment and supplies safe from damp, condensation and rust.
- Prevent costly repairs: Weatherproof panels help avoid damage to walls, doors and roofs caused by wind and rain.
- Long-lasting investment: Durable plastic sheets like acrylic, polycarbonate, Foamex and Dibond provide a cost-effective, long-term solution for your outbuilding.
Plastic Sheet Fixings & Accessories to Reduce Draughts in Sheds & Garages
Here’s a quick reference table showing which accessories work best for different jobs – all available from Cut Plastic Sheeting:
Situation
Best Fixing Solution
How It Helps
Situation
Secondary glazing (windows)
Best Fixing Solution
Magnetic tape / Adhesive tape
How It Helps
Holds acrylic or polycarbonate sheets in place; removable for summer.
Secondary glazing (windows)
Magnetic tape / Adhesive tape
Holds acrylic or polycarbonate sheets in place; removable for summer.
Situation
Sealing gaps in doors/panels
Best Fixing Solution
Foam tape / Double-sided tape
How It Helps
Fills small gaps, blocks draughts, sticks panels securely.
Sealing gaps in doors/panels
Foam tape / Double-sided tape
Fills small gaps, blocks draughts, sticks panels securely.
Situation
Mounting protective panels
Best Fixing Solution
Construction adhesives / Sealants
How It Helps
Securely bond Foamex or Dibond panels to walls/doors.
Mounting protective panels
Construction adhesives / Sealants
Securely bond Foamex or Dibond panels to walls/doors.
Situation
Temporary draught screens
Best Fixing Solution
Magnetic tape / Adhesive strips
How It Helps
Lets you remove panels easily when ventilation is needed again
Temporary draught screens
Magnetic tape / Adhesive strips
Lets you remove panels easily when ventilation is needed again
Quick Tips for Installing Plastic Sheets & Draught-Proofing Your Outbuilding
Measure carefully – Always double-check your measurements before cutting. Cutting your sheets 2 – 3mm smaller than the opening ensures they fit easily without forcing or bending the material, which could cause cracks or damage. Take time to measure both width and height and mark your cutting lines clearly.
Think seasonal – Some draught-proofing fixes are only needed in colder months. Using magnetic strips or removable adhesives allows you to take panels down in spring or summer without leaving marks or damaging surfaces. Planning ahead like this makes maintenance easier and extends the life of your sheets and fixings.
Quick Tips for Installing Plastic Sheets & Draught-Proofing Your Outbuilding
Measure carefully – Always double-check your measurements before cutting. Cutting your sheets 2 – 3mm smaller than the opening ensures they fit easily without forcing or bending the material, which could cause cracks or damage. Take time to measure both width and height and mark your cutting lines clearly.
Think seasonal – Some draught-proofing fixes are only needed in colder months. Using magnetic strips or removable adhesives allows you to take panels down in spring or summer without leaving marks or damaging surfaces. Planning ahead like this makes maintenance easier and extends the life of your sheets and fixings.
Extra tip – When working with larger panels, get a second pair of hands to help with positioning and mounting. It makes installation safer, faster and more precise.
Ready to Keep Draughts Out for Good?
Draught-proofing your shed, garage or workshop doesn’t need to be expensive or complicated. With the right plastic sheets and simple accessories like magnetic tape, double-sided tape and adhesives, you can block cold air, protect your belongings and make your outbuilding much more comfortable this autumn.
What’s more, draught-proofing now means your shed stays comfortable not just through autumn, but right through winter and into spring.
👉 At Cut Plastic Sheeting, discover our full range of acrylic, polycarbonate, Foamex and Dibond sheets along with fixings and adhesives to help you complete your outbuilding projects quickly and efficiently.
Shop Plastic for Draught Proofing
At Cut Plastic Sheeting, we make it easy to get the plastic sheets you need for all your autumn outbuilding projects. Whether you’re sealing gaps, adding secondary glazing, lining walls or patching roofs, our high-quality sheets and accessories help you complete your DIY fixes quickly and effectively.
Thickness of Sheets Available:
Want to know what other materials we offer? Browse here for our full range of high-quality options and find the perfect sheet for your next outbuilding project.
Shop Plastic for Draught Proofing
At Cut Plastic Sheeting, we make it easy to get the plastic sheets you need for all your autumn outbuilding projects. Whether you’re sealing gaps, adding secondary glazing, lining walls or patching roofs, our high-quality sheets and accessories help you complete your DIY fixes quickly and effectively.
Want to know what other materials we offer? Browse here for our full range of high-quality options and find the perfect sheet for your next outbuilding project.
