A solvent-based, instantly waterproofing coating for exterior pitched or flat roofs, bitumen, asbestos cladding, metal, fibreglass roofs and more.
Britannia Aquashield High Build is a solvent-based waterproofing coat for exterior pitched or flat roofs. The product contains embedded fibres which will will cover up any small gaps and cracks.
Ideal for bitumen, metal, fibreglass, porous and non-porous roofs, including iron, steel, slate, polished brick, concrete and asbestos cladding.
These will vary depending on substrate, the site conditions and longevity required.
Typically spreading rates will vary depending on the end use.
Not suitable for heavy foot-traffic areas.
Clear all areas of moss, lichen and debris by brushing or power washing and remove surface water and any contamination such as Oil or Grease and allow to dry. Apply Britannia Fungicidal Wash to prevent further fungal/algal growth.
Most roofing substrates to be treated will not normally require priming.
Highly porous/friable surfaces:
Metal Surfaces:
Including:
All these areas should be suitably prepared and primed as appropriate (see separate technical sheet) before application of Britannia Aquashield Waterproof Roof Coating.
Non-porous substrates:
Bitumen surfaces:
Previously painted or coated substrates:
Splits, cracks, joints and seals, crazed areas:
Surface faults:
In areas where excessive movement may occur, additional reinforcement must be incorporated into the coating.
Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.
 Guy Williams on 2024-01-19 12:24:09 | Question: I have an old 1960s garage with corrugated concrete/asbestos roof. what would be the best product to seal this ? its is approx 16m2 |
Answer from Rawlins’ Technical Team: Assuming it is a flat concrete roof, with a corrugated pitch,that is prepared as detailed in the technical datasheet, Britannia Aquashield High Build will be OK to apply as a finish coat. We would firstly recommend priming with Britannia Aquashield Primer, 2 coats should be sufficient, before a full coat of Britannia Aquashield High Build to finish. With 3-5m2 per litre, 5kg of Primer should be sufficent, and based on 1-2kg per m2 dependent on the substrate, a 20KG pack of Britannia Aquashield High Build will cover 16m2 sufficiently. | |
| Geoff Carr on 2023-10-17 11:57:39 | Question: Can Brittania Aquashield be used on high density polyethylene. Thanks Geoff Carr |
Answer from Rawlins’ Technical Team: Unfortunately no, this product is not suitable for this type of application as it will not adhere to the substrate. | |
| Phil manners on 2022-11-23 12:00:12 | Question: Can I use aquashield high build on a lead valley? Thanks |
Answer from Rawlins’ Technical Team: Unfortunately no, for application to lead assuming it is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Britannia Durashield. This can be applied directly to old lead. | |
| Richard Davies on 2022-04-18 15:05:59 | Question: Can I apply a second coat of Aquashield high-build? (The first coat is a bit patchy- I probably didn't put it on thick enough) |
Answer from Rawlins’ Technical Team: Yes a second coat can be applied assuming the substrate is clean, dry and sound. | |
| Richard Davies on 2022-03-25 12:37:41 | Question: Do I have to use a primer on a fibreglass (GRP) roof? |
Answer from Rawlins’ Technical Team: No, assuming the GRP roof is clean, dry, sound and prepared as detailed in the technical data sheet this can be applied without a primer. | |
| Raymond James Morrison on 2019-07-20 15:50:25 | Question: Hi. I have a bitumen flat roof, it is good condition, however last year I noted thin cracks where appearing along the joint lines and as it is in full sun all day and I wanted to prolong its life I painted it with your Blackfriar Solar reflective paint. Having checked it this year its evident the cracking is again evident and I now thinking the Britannia Aquashield High Build, in solar white, would have been a more suitable product? can I apply this over the Blackfriars? |
Answer from Rawlins’ Technical Team: Please download the Product Data Sheet from the 'Attachments' tab on the Britannia Aquashield High Build product page. This details application to existing coatings and what to do on cracking areas. Should you require any further information please contact our Technical Team on 0113 2455450 (option 2) or email [email protected] | |
| Graham Pye on 2019-03-26 10:39:31 | Question: My lead clad bay window window flat roof approx 2.5m x1m has developed a small leak creating a disclouration on the ceiling below approx 10cm x 5 cm. Needless to say I cannot find the cause despite careful examination! The roof albeit old is generally in good condition. Rather than having a completely new lead roof I am considering painting with a waterproofing paint. Which - if any - of your products would you recommend? Many thanks for your help Regards Graham Pye Can you please |
Answer from Rawlins’ Technical Team: The Britannia Durashield system would be our recommendation for aged lead surfaces. | |
| patrick on 2019-02-22 13:36:44 | Question: Hi. I have just had a bitumen flat roof recovered with a torch on mineral felt. Is there anyhing I can paint onto it to prolong it's life.One part of the roof gets a lot of sun and approx 1/2 of it is in the shade and suffers from a lot of moss. |
Answer from Rawlins’ Technical Team: Britannia Aquashield High Build could be used for this in Solar Reflective White, discolouration may occur over a new asphalt, tar or bitumen surfaces; therefore an extra coat may be required, for decorative purposes only. | |
| gerald corns on 2019-02-11 15:10:25 | Question: I have a Garage that I erected myself about 2 years ago since then I have noting but problems with leaks. I tried all sorts of remedy's. My thinking is now to completely cover the whole roof with something. My garage is 17.7 sq mt Can you please advise me of a product that would do this your sincerely G Corns |
Answer from Rawlins’ Technical Team: You haven't said what your roof is - i.e. felt, metal, asbestos, etc. however if it is a substrate that Britannia Aquashield High Build can be applied to as per the product data sheet then this would be a good potential choice. | |
| Jobn on 2019-02-04 07:42:18 | Question: Hi am looking for white waterproofing paint for the top of my land-rover defender 110 would this work. Many thanks John |
Answer from Rawlins’ Technical Team: We're assuming the surfaces you wish to paint are metal, if so Britannia Aquashield High Build can be used on metal surfaces. Be sure to download and read the product data sheet from the product page for full details on preparing and priming metal. | |
| Daniel Needham on 2018-12-13 22:31:55 | Question: Hello, I have a polycarbonate conservatory roof which has flash banding on some parts. Can I use your aqua shield solar paint on these materials assuming they are clean and dry? Thank you in advance for your assistance. |
Answer from Rawlins’ Technical Team: We would recommend Britannia Aquashield Eco for this application. | |
| Ryan Russell on 2018-12-09 22:48:20 | Question: I have a gutter between the 2 seperate pitched rooves of my house. Most is lead coated but the last and lowest 3 metres has been painted with something similar to your product but old and leaking slightly somewhere. Can I just clean, dry and paint over the leaky area with your product or will the old stuff need scraping off completely and starting again? Thanks. |
Answer from Rawlins’ Technical Team: Ideally we would recommend removing the existing coating to reveal the leaking area to enable you to prime, reinforce and coat the area as needed. If however this is not possible then as long as the existing coating is sound, well adhered and compatible then after cleaning Britannia Aquashield High Build could be applied directly. | |
| Michael Johns on 2018-12-06 16:21:41 | Question: Hello, I have a workshop that has a corrugated metal roof some of which is in less than perfect condition, it would be difficult to remove and replace the roof and I am looking at alternative means of waterproofing it. Some of your products look as if they might be suitable, are you able to recommend any thing that might help. regards Michael Johns |
Answer from Rawlins’ Technical Team: After cleaning, assuming it is bare, weathered galvanised steel we would recommend first priming with Britannia One Pack Etch Primer before application of Britannia Aquashield High Build. | |
Britannia Aquashield High Build is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT
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