Planning

Assess shed dimensions and insulation requirements

Materials

Gather EPS boards, adhesive, tape, and safety gear

Preparation

Clean walls and frame surfaces for installation

Installation

Cut EPS boards to fit and secure to walls

Sealing

Seal joints with tape to prevent thermal bridging

Benefits

Improve energy efficiency and reduce heating costs

insulating a shed with EPS boards: 7 Expert Tips

Ultimate Guide to Insulating a Shed with EPS Boards

For homeowners and DIY enthusiasts alike, insulating a shed with EPS boards offers a cost-effective and efficient way to transform an ordinary garden shed into a comfortable, energy-efficient workspace or storage area. Simple Solutions 4 U brings 15 years of expertise in through-coloured render and External Wall Insulation (EWI) systems to deliver top-quality products and services tailored to your needs.

Why Choose EPS Boards for Shed Insulation?

Expanded Polystyrene (EPS) boards are renowned for their closed-cell structure, providing superior thermal resistance (R-value) and moisture resistance. Compared to other rigid foam boards such as PIR (Polyisocyanurate), EPS boards are around 36% more cost-effective while still delivering robust insulation performance. They are lightweight, easy to cut, and compatible with various render and plaster finishes – ideal for DIY or professional installations.

High thermal performance to maintain year-round comfort
Moisture-resistant properties prevent condensation and mould
Lightweight and easy to handle for quick installation
Cost-effective compared to other rigid foam boards

Step-by-Step Installation Process

1. Preparation and Planning

Begin by clearing the shed completely and storing any items safely. Inspect walls, floor, roof, windows, and doors for gaps, cracks, or damage. Measure all surfaces carefully to determine the quantity and dimensions of EPS boards required. Gather tools including a tape measure, utility knife, spirit level, and drill with insulation anchors. Simple Solutions 4 U bespoke cutting services ensure a precise fit and minimal waste.

2. Surface Preparation

Ensure all surfaces are clean, dry, and free of debris. Repair any structural defects with suitable filler and sand smooth. For timber sheds, fit a breathable membrane to protect against damp and prolong the life of your insulation.

3. Cutting and Fitting EPS Boards

Mark and cut EPS boards using a sharp utility knife or saw, allowing a 2–3 mm expansion gap.
Dry-fit boards to verify alignment and spacing before adhesive application.
Apply a high-performance adhesive such as CT 85 Flex Adhesive to the back of each board in an even bead pattern.
Press boards firmly onto the surface, starting from one corner and working across. Use a spirit level to keep panels plumb.
Secure boards with mechanical fixings (insulation anchors) driven into solid studs or framing for added stability.

4. Sealing Joints and Edges

Prevent thermal bridging and air leaks by sealing all joints with low-expansion foam or accredited weatherproof tape such as Blue Dolphin TarpStucco Tape. Ensure edges around windows, doors, and any service penetrations are completely airtight to maximise efficiency.

5. Applying Render or Plaster Finish

Once EPS boards are secured and sealed, apply a base coat render reinforced with fibreglass mesh like Ceresit CT 325 Mesh Roll. After curing, finish with a through-coloured render or decorative plaster such as Atlas GTA Finishing Plaster to achieve a durable, attractive surface.

Key Benefits of Professional Installation by Simple Solutions 4 U

Expertise: 15 years of experience in EWI systems and renders ensures flawless results.
Quality Materials: Partnership with top suppliers guarantees premium EPS boards, adhesives, and renders.
Competitive Pricing: Trade discounts available alongside unbeatable service.
Customer Focus: Personalized attention to your project and satisfaction.

Cost Considerations and Savings

Insulating a shed with EPS boards typically costs between £20–£30 per square metre, including materials but excluding labour. DIY installations save on labour costs—see our DIY budgeting guide—while professional fitting ensures optimal performance and long-term durability. Energy savings of up to 30% on heating and cooling can be achieved; consider thermal imaging to verify insulation effectiveness.

Maintenance and Longevity

EPS insulation is durable and rot-proof, resisting moisture ingress for years. Conduct annual inspections to check for damage or wear around corners and seal any small cracks with a matching weatherproof sealant to maintain peak thermal efficiency.

Frequently Asked Questions

Can EPS boards be painted?: Yes. Use a breathable masonry paint compatible with render finishes for best results.
Are EPS boards fire-safe?: EPS boards should be covered with a render or plaster finish and fire-rated where required by building regulations.
How thick should the EPS boards be?: For sheds, 50 mm to 100 mm thickness offers a balance between space and performance.