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Sun Tunnel For Flat Roof - Monodraught Sunpipe®

(13 reviews) Free delivery
  • £194.00

  • Inc. VAT £232.80
  • Price on request
  • Not available in this size
  • Sizes over 900mm must be hinged on the long side

Product Code: Monodraught Flat Roof

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Monodraught Flat Roof Sun Tunnel Kit

The SUNPIPE natural daylight sun tunnel for flat roof directs sunlight into a room from roof level. The SUNPIPE collects daylight using a patented Diamond dome, using a silverised PVD coated mirror-finished aluminium tube to transfer light to a room, with a ceiling diffuser evenly distributing the light around the room. SUNPIPES are suited to almost any application, and have been installed anywhere from residential bedrooms to the Olympic Handball Arena in London.

All sunpipe systems are guaranteed for 10 years


Available in 4 different sizes, the larger the size the more light the sun tunnel for flat roof will pass.

Area to be Lit(To a Normal Daylight Condition) SUNPIPE Size
Approx 7.5 m2 (80 Sq. ft.) 230 mm (9” dia)
Approx 14 m2 (150 Sq. ft. 300 mm (12” dia)
Approx 22 m2 (230 Sq. ft.) 450 mm (18” dia)
Approx 40 m2 (430 Sq. ft.) 530 mm (21” dia)

Tables from research conducted by the University of Nottingham showing output of a 300 mm dia. SUNPIPE to a flat roof application.

Sun Tunnel for Flat Roof

Monodraught sun tunnels are a revolutionary new way to get natural daylight from rooftops into interiors to brighten dark rooms and underground spaces. These sun pipes are suited to almost any application, Not suitable for Rubber roofs (EPDM)  and have been installed anywhere from residential Hallways to commercial properties.

Light Output

Sun tunnel light output

Extension Calculation

Overall Length (‘X’) No. of Extensions
Up to 600 mm (4 ft) None
Up to 1200 mm (4 ft) One
1200 mm (4 ft) to 1800 mm (6 ft) Two
1800 mm (6 ft) to 2400 mm (8 ft) Three
2400 mm (8 ft) to 3000 mm (10 ft) Four
2300 mm (10 ft) to 3660 mm (12 ft) Five
Over 3660 mm (12 ft) add one length per extra 610 mm (2ft)


  230 300 450 530
SUNPIPE Diameter [mm] 230 305 457 535
Roof and Ceiling Opening Ø [mm] 250 320 470 550
Extensions calculation

Lengths & Bends

Smaller sizes have a recommended total maximum pipe length of 8 m. Larger sizes allow for longer lengths to be used.

There is a 12% reduction of light output for each 45° bend used and there is a 6% reduction in light transmission for every metre of SUNPIPE.

30° & 45° adjustable elbows can be used with all SUNPIPE applications to direct daylight to where it is required.


Sun Tunnel for flat roof
Polycarbonate Diamond Dome

1. Acrylic Diamond Dome

As Standard we use high impact acrylic in our patented Diamond domes which maximises the penetration of natural daylight.

Galvanised flashing plate

2. Galvanised Flashing Plate and ABS Collar

Galvanised Flashing plate manufactured from 0.8mm galvanized mild steel which is corrosion resistant and suitable for felt, membrane and asphalt roof finishes. Supplied with an ABS (acrylonitrile-butadiene styrene) collar for dome to fit on to.

Plain pipe

3. 610 Plain End Pipe

The 610mm plain end pipe is manufactured from 0.5mm thick anodized aluminium pipe and is coated with MIRO SILVER® 27/427OAG to maximise reflections and limit light diffusion.


4. Plywood Backing Plate/Template

The 4mm thick plywood backing plate/template can be used to 'mark out' the opening at ceiling level and to provide additional structural fixing for the diffuser.

Ceiling extension

5. 250 Ceiling Extension

The 250mm ceiling extension is manufactured from 0.5mm thick anodized aluminium pipe and is coated with MIRO SILVER® 27/427OAG to maximise reflections and limit light diffusion. This provides a permanent joint between the diffuser and plain end pipe.

Ceiling Diffuser

6. Double Glazed MicroPrism Ceiling Diffuser

The double glazed microprism diffuser is designed to offer excellent thermal performance whilst ensuring maximum spread of natural daylight within the space and an even light distribution. The trim is supplied in white as standard. 230mm Sunlumes are provided with a 3-piece polycarbonate diffuser.



Reduced Carbon Emissions


  • Increased achievement rates
  • Reduced fatigue factors
  • Improved health and attendance
  • Enhanced general development

Health Care

  • Combats the condition of SAD
  • No maintenance no disruption
  • Typical payback period of 5 - 6 years


  • Addition of skylights proven to produce a 40% increase in sales


  • 20% increase in employee output
  • Reduced absence because of sickness
  • Reduced instances of Sick Building Syndrome (SBS)

Improved Health

  • Boosted levels of Dopamine, Endorphins, Cortisone, Testosterone in men, and Vitamin D

Related Information

Monodraught Installation Instructions (3.16 MB) Download
Delivery Information

Free Delivery to Mainland UK during normal weekday working hours. Delivery charges may apply to other areas of the UK. Delivery costs will be update at checkout if required.

We aim to deliver Sun Tunnels within 2-3 working days from Order (during weekday working hours only).

All deliveries are made by way of courier and require a signature. Products will usually be delivered between the hours of 8:00 a.m. and 6:00 p.m. Monday to Friday only. Please assist us by ensuring that someone will be available to sign for the goods during this time. Please let us know if you have any specific delivery requirements including site restrictions/access requirements to avoid delivery delays or cancellations.

Please note that we cannot guarantee any delivery dates or times and we will not be held responsible for any losses incurred due to late deliveries. We recommend that no labour is booked until the goods have been safely received and checked to avoid such losses and inconvenience to you.


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Ian Surgenor - 23/03/2021

Excellent product delivered early. Very happy and would highly recommend

steve wright - 18/01/2021

Product is excellent and at a great price too. They were on hand to sort out the delivery issues to minimise the impact. Will definitely use them again

Annaluisa Wood - 17/12/2020

Quick prompt service delivery, no complaints.

Anon - 04/12/2020

Great sun tunnel, arrived within a reasonable timeframe and customer services were very helpful when I realised I needed two extension units

Ian C - 20/11/2020

Very good. Very helpful - great product

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