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  1. Home
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  3. Soffit Boards
  4. Hollow Soffit Boards

Hollow Soffit Boards

Our ranges of Hollow Soffit are available in widths of 300mm and due to their cleverly designed joint system can be fitted together to cover wider gaps. These UPVC Soffit Boards are a rigid hollow board  - whilst they are not as strong as standard plain boards, soffits are non load-bearing so hollow soffits provide a cost effective alternative that have become popular with builders and roofline installers.

As these boards have tongue and groove joints, which means they fit together edge to edge, they are popular for use on particularly wide soffit details, resembling traditional matchboard cladding as they do. Many installers like to cut hollow soffit into short lengths and run them from the fascia back to the brickwork, using the tongue and groove joints to form long sections.

Our UPVC Hollow Soffit is available in Anthracite Grey, Rosewood, Golden Oak, and Black Ash as well as White, and the range is completed by a variety of trims for ease of installation and a neat finish.

Read more details

Cutting Hollow Soffit Boards

You can use a fine-toothed hand saw to cut hollow soffit boards down, but most people find it easier and quicker to use a jigsaw. Jigsaws with a fine blade give a very neat cut on Floplast Hollow Soffit Boards.

 

How to Calculate How Much Hollow Soffit You'll Need When Using Short Lengths

As the majority of our customers cut hollow soffit into short lengths that they run from rear of the fascia back to the wall, they are often unsure how to calculate how many lengths they will need. Here's how to do it. Measure the distance in millimetres from the rear of the fascia to the wall. Divide 5000 by whatever the measurement is. So for example if the measurement is 250mm, divide 5000 by 250 to get 20. That tells you that each 5m length will give you 20 short pieces.

Now, multiply 20 (or whatever your answer was) by 0.3. We do this as hollow soffit is 300mm wide, so each cut piece will take you 0.3m along the length of the soffit. So in our example, 20 x 0.3m = 6m. This means that each length of hollow soffit in this example will cover 6m when cut into short pieces. From there, simply measure the length of all of your soffit and divide that by 6 (in this example), i.e. if your total soffit length is 66m you will need to order 11 lengths (66 / 11 = 6).

Whilst there is hardly any wastage when hollow soffit is used in this way we would always suggest that you order one extra length - just in case you make a mistake!

 

Hollow Soffit Edge Trims

You have the choice of either a J Trim or an F Trim, depending upon how the trim itself is to be fixed. J trims, shaped like the letter J, are fixed either to the underside of the soffit bearers or they are fixed directly through the middle of the channel into the brickwork. J trims are the most commonly used edge channel for hollow soffit.

F trims, shaped like an upside down letter F, are fixed through the the longest leg directly into the brickwork. All trims are 5M long. No sealant is required with these trims.

 

Joints and Corners

H trim is used to join lengths of hollow soffit that are run longitudinally - with the grooves running parallel to the wall. H trim is also used at the corners, with the front and back of the H trim cut into an arrow head shape to fit the corner.

If the Hollow Soffit is used on short lengths, with the grooves running back to the wall, each piece is joined to the next using the integral tongue and grooves, with H section still used to form the centre of the mitred corner.

 

Hollow Soffit Guarantee

When used in a soffit application all of our hollow soffits carry a 10 year performance and colour guarantee.

For further information about all of our products please visit our Guides and Tips section which is packed full of helpful hints, tips and videos.

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Hollow Soffit comes in widths of 300mm and due to the cleverly designed joint system boards can be fitted together to cover wider gaps. As hollow soffit is non load-bearing, this system provides a cost-effective alternative to plain soffit that is popular with builders and roofline installers alike. Read more about Hollow Soffit Boards

Hollow Soffit at a glance

  • Manufactured by FloPlast.
  • 300mm Wide Tongue and Groove Effect
  • Weather, chemical and impact resistant
  • Maintenance free
  • Class 1 Fire Rated
  • 10 Year Guarantee

To cut hollow soffit use a fine-toothed hand saw or a jigsaw fitted with a fine blade.

To fix hollow soffit at the wall side use either a J Trim or an F Trim. J trims, shaped like the letter J, are fixed either to the underside of the soffit bearers or to a batten screwed to the brickwork. J trims are the most commonly used edge channel for hollow soffit. F trims, shaped like an upside down letter F, are fixed through the the longest leg directly into the brickwork. All trims are 5M long. No sealant is required.

To join lengths of hollow soffit that are run longitudinally - with the grooves running parallel to the wall - use an H Trim. H trim is also used at the corners, with the front and back of the H trim cut into an arrow head shape to fit the corner. When using short lengths with the grooves running back to the wall, each piece is joined to the next using the integral tongue and grooves, with H section still used to form the centre of the mitred corner.

For further information about all of our products please visit our Guides and Tips section which is packed full of helpful hints, tips and videos.

Hide details

Hollow Soffit Board White 300mm x 10mm x 5M

300mm

Hollow Soffit Board White 300mm x 10mm x 5M

From 17 reviews

Code: H300 Size: 300mm Brand: FloPlast

£9.24 ex.VAT
£9.24 ex.VAT
From 17 reviews

300mm Hollow Soffit White (Pk 5)

300mm

300mm Hollow Soffit White (Pk 5)

From 10 reviews

Code: H300PACK Size: H300mm x D18mm x L5000mm

£44.63 ex.VAT
£44.63 ex.VAT
From 10 reviews

Hollow Soffit F Trim White 5M

White

Hollow Soffit F Trim White 5M

From 7 reviews

Code: HF Size: 5M Trim Length Brand: FloPlast

£4.49 ex.VAT
£4.49 ex.VAT
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Hollow Soffit H Trim White 5M

White

Hollow Soffit H Trim White 5M

From 6 reviews

Code: HH Size: 5M Trim Length Brand: FloPlast

£5.66 ex.VAT
£5.66 ex.VAT
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Hollow Soffit J Trim White 5M

White

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Code: HJ Size: 5M Trim Length Brand: FloPlast

£4.49 ex.VAT
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Hollow Soffit Board Anthracite Grey 300mm x 10mm x 5M

300mm

Hollow Soffit Board Anthracite Grey 300mm x 10mm x 5M

Code: H300WA Size: 300mm Brand: FloPlast

£37.00 ex.VAT
£37.00 ex.VAT

Hollow Soffit J Trim Anthracite Grey 5M

Anthracite Grey

Hollow Soffit J Trim Anthracite Grey 5M

Code: HJWA Size: 5M Trim Length Brand: FloPlast

£11.39 ex.VAT
£11.39 ex.VAT

Hollow Soffit H Trim Anthracite Grey 5M

Anthracite Grey

Hollow Soffit H Trim Anthracite Grey 5M

Code: HHWA Size: 5M Trim Length Brand: FloPlast

£11.83 ex.VAT
£11.83 ex.VAT

Hollow Soffit Board Black Ash 300mm x 10mm x 5M

300mm

Hollow Soffit Board Black Ash 300mm x 10mm x 5M

Code: H300WB Size: 300mm Brand: FloPlast

£37.00 ex.VAT
£37.00 ex.VAT

Hollow Soffit J Trim Black Ash 5M

Black Ash

Hollow Soffit J Trim Black Ash 5M

Code: HJWB Size: 5M Trim Length Brand: FloPlast

£11.39 ex.VAT
£11.39 ex.VAT

Hollow Soffit H Trim Black Ash 5M

Black Ash

Hollow Soffit H Trim Black Ash 5M

Code: HHWB Size: 5M Trim Length Brand: FloPlast

£11.83 ex.VAT
£11.83 ex.VAT

Hollow Soffit F Trim Black Ash 5M

Black Ash

Hollow Soffit F Trim Black Ash 5M

Code: HFWB Size: W300mm x D26mm x L5000mm Brand: FloPLast

£13.20 ex.VAT
£13.20 ex.VAT

Hollow Soffit Board Rosewood 300mm x 10mm x 5M

300mm

Hollow Soffit Board Rosewood 300mm x 10mm x 5M

Code: H300WR Size: 300mm Brand: FloPlast

£37.00 ex.VAT
£37.00 ex.VAT

Hollow Soffit J Trim Rosewood 5M

Rosewood

Hollow Soffit J Trim Rosewood 5M

Code: HJWR Size: 5M Trim Length Brand: FloPlast

£11.39 ex.VAT
£11.39 ex.VAT

Hollow Soffit H Trim Rosewood 5M

Rosewood

Hollow Soffit H Trim Rosewood 5M

Code: HHWR Size: 5M Trim Length Brand: FloPlast

£11.83 ex.VAT
£11.83 ex.VAT

Hollow Soffit F Trim Rosewood 5M

Rosewood

Hollow Soffit F Trim Rosewood 5M

Code: HFWR Size: 5M Trim Length Brand: FloPlast

£13.20 ex.VAT
£13.20 ex.VAT

Hollow Soffit Board Golden Oak 300mm x 10mm x 5M

300mm

Hollow Soffit Board Golden Oak 300mm x 10mm x 5M

Code: H300WG Size: 300mm Brand: FloPlast

£37.00 ex.VAT
£37.00 ex.VAT

Hollow Soffit H Trim Golden Oak 5M

Golden Oak

Hollow Soffit H Trim Golden Oak 5M

Code: HHWG Size: 5M Trim Length Brand: FloPlast

£11.83 ex.VAT
£11.83 ex.VAT

Hollow Soffit J Trim Golden Oak 5M

Golden Oak

Hollow Soffit J Trim Golden Oak 5M

Code: HJWG Size: 5M Trim Length Brand: FloPlast

£11.39 ex.VAT
£11.39 ex.VAT

Hollow Soffit F Trim Golden Oak 5M

Golden Oak

Hollow Soffit F Trim Golden Oak 5M

Code: HFWG Size: W300mm x D26mm x L5000mm Brand: FloPLast

£13.20 ex.VAT
£13.20 ex.VAT

Plastic Headed Pins 30mm Brown (box 250)

30mm

Plastic Headed Pins 30mm Brown (box 250)

Code: TT30BN1 Size: 30mm Brand: Seac

£12.50 ex.VAT
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Plastic Headed Pins 30mm Oak (box 250)

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Plastic Headed Pins 30mm Oak (box 250)

Code: TT30OAK1 Size: 30mm Brand: Seac

£12.50 ex.VAT
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