The interlock shingle has a base which is nothing more than really thick paper. A shingle manufacturer will dip the paper into asphalt and then granulate the shingle. The design of the shingle has been made to move after it is placed on the roof. With a letter T shape and it's ability to lock into lace made this shingle ideal for shiplap decks and going over cedar shake.
Before building code in Vancouver required a home owner do several things to the home but taking off your old roof for a new roof was definitely not one of the rules. This being said the average home owner would look at the cost of taking a roof off or putting a new one over the old and they always picked the first. Keeping your old roof must of saved the home owner thousands and as a result interlock was the most popular shingle.
Iko who makes interlock had a little of a difficult time in the Greater Vancouver region with all our trees and rain. with the high condensation and debris that decomposed on roofs interlock had a tough time trying to make it to it's warranty. Unusually wide or thin shiplap as a nice big tree over your house your interlock probably will not last more than half of the warranty.
So now that interlock is gone what now? well building code requires all old roofs come off before a new roof. The other is a shiplap deck, all roofing companies out there must inform the customer that the only way any roof manufacturer in North America is going to give a full warranty is if the shingles sit on plywood. In other words all roofing manufacturer would rather see shiplap decks disappear than come up with a shingle that can sit directly on shiplap
Interlock is made by Iko and is still available on the east coast. The average warranty on the interlock is 20 to 25 years where the starting warranty on a fibreglass shingle is 30.
Greater Vancouver roofing company
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