With the new r.16 roof tile, prefa has developed a minimalist roof design which allows the greatest possible scope for realising distinctive architecture: thanks to the large format of 70 cm in length, it is now possible to cover the roof with 3.4 roof tiles per square metre, while at the same time, achieving exceptional aesthetic effects.. You're reviewing: roof tile custom hatch pattern -16 how do you rate this product? * 1 star 2 stars 3 stars 4 stars 5 stars; product *nickname *summary of your review *review. submit review. roof tile custom hatch pattern -16 by shujahat hussain. free. royalty free license | faq. roof tile custom hatch pattern -16.