![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/SENTINEL-LOGO-1-2-300x203.png)
THE ULTIMATE GRP ROOFING SYSTEM
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/sentinel-image-.png)
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Durable and long-lasting
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Lightweight
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Seamless
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Versatile
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Low maintenance
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/Drip-trim-web-01.png)
A170 Small Drip
Flat roof edge above gutter.
80mm x 70mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/Drip-trim-web-01.png)
A200 Standard Drip
Flat roof edge above gutter.
80mm x 90mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/A250-large-drip-01.png)
A250 Large Drip
Flat roof edge above gutter.
80mm x 140mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/B230-raised-edge-01.png)
B230 Raised Edge
Fitted to prevent water run off.
100mm x 105mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/B260-raised-edge-01.png)
B260 Raised Edge
Fitted to prevent water run off.
100mm x 130mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/B260-raised-edge-01.png)
B300 Raised Edge
Fitted to prevent water run off.
100mm x 180mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/d260-angle-fillet-01.png)
D260 Angle Fillet
Buts up against up-stand wall.
110mm x 60mm 75mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/d300-angle-fillet-01.png)
D300 Angle Fillet
Buts up against up-stand wall.
185mm x 60mm x 85mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/ER35-Ridge-roll-01.png)
ER35/40 Ridge Roll
Simulates lead roll.
65mm x 90mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/E280-expansion-01.png)
E280 Expansion
For use on large areas.
65mm x 185mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/f300-flat-sheet-01.png)
F300 Flat Sheet
300mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/external-internal-AT195-.png)
AT195 External
75mm x 120mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/external-internal-AT195--e1682669879530.png)
AT195 Internal
65mm x 185mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/c100-simulated-lead-01.png)
C100 Simulated lead
Replaces traditional lead flashing.
30mm x 100mm
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/c150-Long-leg-simulated-lead-01.png)
C150 long leg simulated lead
Replaces traditional lead flashing.
30mm x 150km
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/c1-external-corner-01.png)
C1 Universal External Corner
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/c4-internal-corner-01.png)
C4 Universal Internal Corner
GRP Range of Tools
Downloads
Data Sheets
Material Safety Data Sheets
Installation Guides
Full Range of Trims
Estimating Quantities Guide
GRP Materials Calculator
GRP Before & After Slider
![](https://principalbuildingproducts.com/wp-content/uploads/2023/10/grp-bay-window-before-image_-2.png)
![](https://principalbuildingproducts.com/wp-content/uploads/2023/10/grp-after-photo-bay-window_-2.png)
Installation Video
Sentinel GRP Installation Guide
Our Sentinel GRP installation guide is a comprehensive step by step booklet including our full range of trims and an easy to follow estimating materials guide.
![](https://principalbuildingproducts.com/wp-content/uploads/2023/04/sentinel-brochure-mock-up-.png)
Contact Our Technical Team
Consult our technical support experts for personalised advice on your GRP Roofing Project.
01709 728150