A core component of any roofing project, undercloak is a strong tile or fibre cement strip that is fixed at the roof verge, beneath the battens. This will provide an effective underlayer to support a bed of mortar and allow for mortar adhesion, whilst also offering a clean finish to the verge detail.
What is undercloak on a roof? Undercloak is a strong fibre cement strip that is fixed at the roof verge, underneath the battens. Underclock used to frequently contain asbestos, so if you have a survey done on a house, you may be advised to replace old undercloack. Undercloack nowadays is made using cement, so it’s perfectly safe to install.
Do I need universal undercloak?
Yes, undercloak is often overlooked but is an essential part of the verge for slate and tiled roofs. It protects the layer of sand and cement mix that is typically used on a roof verge, and a lapse in the maintenance of undercloack can result in damage such as timber decay or slipped tiles — so it’s an essential pitched roof accessory to have!