Headlap is a technical term that relates to how slates are lapped and fixed on a roof. In Australia, the usual headlap for a roof with a pitch of 40 degrees is 75mm. This means that...
Read MoreHeadlap is a technical term that relates to how slates are lapped and fixed on a roof. In Australia, the usual headlap for a roof with a pitch of 40 degrees is 75mm. This means that...
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