Are composite doors cheaper than uPVC?

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5. What does GRP stand for?
6. Who invented GRP?
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Tags

1. #composite
2. #draft
3. #double
4. #intruders
5. #efficient
6. #proof
7. #doors
8. #timber
9. #normally
10. #standard
11. #rather
12. #necessarily
13. #inexpensive
14. #would
15. #whilst
16. #material
17. #glazed
18. #clean
19. #generally
20. #thermally
21. #strongest