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GRP Flat Roofing

Castlebrook GRP/Fibreglass


The Next Generation In Flat Roofing 

Old Flat Roof Technology 

Traditional flat roof coverings rely on bitumen, lead or asbestos. Felt is the most common roof covering onto hot bitumen but unfortunately felt breaks down in Britains weather and the strip laid method creates seams which are obvious areas of weakness and prone to leaking. These factors combine to give the traditional felt roof covering a very unpredictable lifespan, needing constant repair and eventually replacement.

Step into the Future and say Goodbye to leaks Forever...

Castlebrook GRP was set up to develop a clean, long lasting solution to flat roof leakage. We spent a great deal of time assessing all available materials and methods of application. The decision was finally taken to use a radical new approach taking a lead from manufacturers of high performance boats rather than traditional building materials. This material was glass fibre, this material is far stronger and more durable than any other roofing product in todays market place creating a maintenance free finish allowing flexibility with no seams or joins whatsoever across its entire area, eliminating any risk of leakage. 


What is GRP Fibreglass Roof

A GRP / Fibreglass flat roof is a single ply GRP laminate consisting of roofing resin and chopped strand mat reinforcement applied in situ over a good quality OSB3 deck.The roof is finished with pre-formed GRP edge trims and a coat of pre-pigmented topcoat available in standard grey or any colour in the BS400 range

  • Tough and hard wearing
  • Lasts at least 20 years
  • Can be repaired if physically damaged
  • Can be extended or refurbished
  • Can be tiled or used as a garden platform
  • Replaces lead and has no intrinsic value to thieves


Approved Contractors

Castlebrook are approved installers of Colorplas GRP Roofsheild and all installations come with a 20 year written Guarantee.

We have carried out many installations over the past few years below are a few examples.



Greater Manchester


Altrincham, Ashton-under-Lyne, Bolton, Bramhall, Bury, Chadderton, Cheadle Hulme, Droylsden, Dukinfield, Eccles, Failsworth, Hazel Grove, Hollingworth, Hyde, Irlam, Leigh, Manchester, Marple, Middleton, Northenden, Oldham, Pendlebury, Prestwich, Radcliffe, Ramsbottom, Royton, Rochdale, Saddleworth, Sale, Salford, Stalybridge, Stockport, Stretford, Swinton, Timperley, Urmston, Whitefield, Wigan and Wythenshawe.




Preston, Blackburn, Burnley, Bolton, Rochdale, Bury, Chorley, Darwen, Rawtenstall, Ramsbottom, Whitworth, Littleborough and Horwich Preston


West Yorkshire


Addingham, Arthington, Bradford, Beeston, Bramley, Castleford, Cleckheaton, Dewsbury, Featherstone, Garforth, Halifax, Huddersfield, Ilkley, Keighley, Leeds, Lydgate, Marsden, Otley, Pontefract, Ripponden, Skelmanthorpe, Todmorden and Wakefield

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