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Roller shutter side panels vs insulation mat

Updated: 22 October 2026

You unscrew the inspection lid above a bedroom window and the box feels colder than the plaster around it. The listing photo looks like a complete kit, so a £4.45 pair of boards is easy to treat as the whole job. Roller shutter side panels vs insulation mat is the split between the two short cheeks and the long inner face. Schellenberg 66272 (B006JJDVNY) is two 15 mm Neopor side panels. The 13 mm sheet (B006JJ3E4A) and the two 3 mm rolls (B01M12RO34) cover that long face. The [roller shutter insulation comparison](/hub/heating/roller-shutter-insulation) holds the three rows. Read the component line before you trust the photograph. A qualifying purchase can earn a commission at no extra cost to you.

You unscrew the inspection lid above a bedroom window and the box feels colder than the plaster around it. The listing photo looks like a complete kit, so a £4.45 pair of boards is easy to treat as the whole job.

Our top picks

Schellenberg Schellenberg 66267

Best overall

Schellenberg Schellenberg 66267
8.6/10about £17.28
View offer
Schellenberg Schellenberg 66257

Rank 2

Schellenberg Schellenberg 66257
8.4/10about £35.61
View offer
Schellenberg Schellenberg 66272

Best value

Schellenberg Schellenberg 66272
8.2/10about £4.45
View offer
On this page
  1. 1.Two boards are the cheeks
  2. 2.The mat and the rolls cover the long face
  3. 3.When you buy both
  4. 4.What neither pack seals

Two boards are the cheeks

B006JJDVNY is two side panels, 15 mm Neopor, at £4.45. Schellenberg lists 66272 as the cheek part that complements a mat. WLG 031 on the German page is not on the amazon.co.uk spec table, so leave it off your decision. The included-components line says two side panels. Reviews say the photo looked like a full liner and the parcel held two boards. If a bullet calls the foam flexible and a reviewer calls the boards rigid, believe the shape you can return. Use 66272 when those cheeks are still bare and 15 mm still clears the raised curtain. The cold lid still needs the 13 mm mat or the 3 mm rolls.

The mat and the rolls cover the long face

The long inner face runs the width of the window. Two cheek boards never reach it. That job is B006JJ3E4A, one 13 mm mat, 100 by 50 cm, at £35.61, or B01M12RO34, two 3 mm rolls at £17.28 when the gap is tight. A two-part mat such as 66282 is not a row here. If the lid is longer than 100 cm, one mat stops short. The rolls still line the long face when 13 mm would meet the curtain. Clearance sits on the roller shutter insulation buying guide. Either pack leaves the cheeks bare unless you add 66272. The best roller shutter box insulation page judges the three as a set.
Schellenberg Schellenberg 66267

Testsieger

Schellenberg Schellenberg 66267
8.6/10about £17.28
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When you buy both

Buy both only after you have measured each cheek and the long face with the curtain fully raised. If both are bare, 66272 plus the mat, or 66272 plus the rolls, matches the side piece as a supplement. If only the ends are bare, the £4.45 boards are the add-on. Cheeks plus the mat at £35.61 come to £40.06 before adhesive. Cheeks plus the rolls at £17.28 come to £21.73. One cheek may already be foamed, or 13 mm may rub. A clear case for both is a bedroom window, cheeks and lid unlined, with room for 13 mm on the long face and 15 mm on the ends.

What neither pack seals

A cheek board and a lid mat both stop short of an airtight box. Fit notes say the joints and the belt opening still leak after boards are fitted. The long joint at the lid often matters more than the single belt hole. Two 15 mm cheeks will not close a whistling strap slot, and a mat on the lid will not close it either, unless you seal that opening separately. A cold lid points you to the mat or the rolls. Bare cheeks point you to 66272. Fitting order is on the how to insulate a roller shutter box page.

Common questions

Are the two boards a complete kit?
No. B006JJDVNY contains two roller shutter box insulation side panels. The listing is Schellenberg 66272, 15 mm Neopor, at £4.45. The manufacturer presents those boards as the side piece that complements a mat. Shoppers who trusted the photo found the parcel was not a full liner. If the cold surface is the long inner face, this pack does not cover it.
If I only buy the mat, are the cheeks still bare?
Yes, unless something else is already fixed to them. The 13 mm mat, B006JJ3E4A, is one sheet of 100 by 50 cm at £35.61, and it lines a rectangle on the long face. It does not wrap the two short ends. The two 3 mm rolls, B01M12RO34 at £17.28, have the same limit when the gap is tight. The cheeks stay bare until you add a side-panel pack.
Can side panels alone warm a cold lid?
They cannot reach it. Two 15 mm cheeks sit at the ends of the box. The long panel that faces the room stays as cold as it was. That is why £4.45 can look like the bargain and still leave the chill you noticed. Use the mat or the rolls for that face. Use the boards for the cheeks, after you have checked that 15 mm clears the curtain.
Why do reviews say the boards are rigid if a bullet says flexible?
A generic bullet can call the foam flexible, while the part in the box is a board you cut to a cheek. Reviewers who expected a soft roll, after a photo that looked like a full kit, call the boards rigid. For 66272, trust the included-components line: two side panels, 15 mm. This listing will not sheet the long face, however you bend a corner of the board.
Will cheeks stop the draught at the belt?
Not on their own. The belt or strap opening is a separate hole between the box and the room. Fit notes say the joints and that opening still leak after boards are fitted. A mat on the lid leaves the same hole unless you seal the slot itself. The long joint where the lid meets the box often matters more than the single belt hole. Cheeks are not a belt seal.

Related pages

Insulation for a narrow roller shutter box

Roller shutter insulation

Best roller shutter box insulation for the cold lid

Roller shutter insulation: thickness, faces, fixing

How to insulate a roller shutter box, step by step

Sources

Public UK and manufacturer sources named below. amazon.co.uk prices, stars and review counts are from the saved extracts for B01M12RO34, B006JJ3E4A and B006JJDVNY. Page updated October 2026. This is not a lab test.

  1. Approved Document L, Volume 1 (2021, 2023 amendments) (retrieved 21 October 2026)
  2. Energy Saving Trust — draught proofing (retrieved 21 October 2026)
  3. Passipedia — insulating roller shutter boxes (retrieved 21 October 2026)
  4. Schellenberg 66272 side panels (retrieved 21 October 2026)
  5. Schellenberg 66257 shop page (retrieved 21 October 2026)
  6. Fire Protection Association — cavity barriers (retrieved 21 October 2026)
  7. amazon.co.uk — Schellenberg 66267 (retrieved 21 October 2026)
  8. French 66267 page noting WLG 033 (retrieved 21 October 2026)