OSB slabs are often used in roofing structures as a solid base for various roofing materials. If slate is laid on top of OSB, it is important to properly protect the slab from moisture. Despite the fact that slate is a fairly reliable roofing material, the roofing structure itself should not remain without additional protection from atmospheric moisture and condensation. Rain, snow, temperature fluctuations, and condensation can cause the OSB to become humidified. With prolonged exposure to water, the plate can swell, deform and gradually lose its operational properties. Therefore, OSB protection under slate should be provided even at the stage of roof installation.
Why OSB under slate can get wet
Slate protects the roof from precipitation, but water can enter the roof space through various sections of the structure. Damaged slate sheets, leaky joints, improper mounting of the ridge or abutments may be the cause of OSB moisture. Another source of moisture is condensation. With temperature fluctuations, moisture may form on the underside of the roofing and other structural elements. If the under-roof space is poorly ventilated, condensation can accumulate and humidify the OSB.
Which OSB should I use for the slate
It is important to choose OSB for roofing structures. https://ukrstroyka.com.ua/osb / with suitable performance characteristics. At high humidity, moisture-resistant plates, such as OSB-3, are usually considered. However, moisture-proof OSB is not a completely waterproof material. Even the OSB-3 cannot be left unprotected from the constant effects of rain, snow, or condensation. When choosing a slab, it is necessary to take into account the roof structure, the pitch of the rafters or laths, the expected load and the recommendations of the OSB manufacturer.
Do I need waterproofing under the slate
Yes, it is recommended to provide a layer of waterproofing or roofing membrane in the roofing structure, if this corresponds to the chosen roof design. The waterproofing layer performs an important function: it helps to protect the insulation and wooden structural elements from moisture that can penetrate under the roofing. At the same time, it is necessary to correctly position all the layers of the roofing pie. The membrane should not be installed arbitrarily — its position depends on the type of material and roof structure.
How to properly protect OSB under slate
Reliable OSB protection does not consist of one material, but of several elements of the roofing system. Basic protection measures:
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Using OSB suitable for the operating conditions;
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Installation of under-roof waterproofing
