Mechanical ventilation systems have long been required in Canadian buildings, including houses. There are requirements for these systems - usually heat recovery ventilators - in terms of how much air they provide to each area. Effective immediately, our office is requiring ventilation installers to certify…
A couple of times a year, our office receives a call from a contractor trying to figure out what grade of shingle should be used on the side of a house. One of the reasons for this lies in the fact that some installers have…