Do you need to remove the ads? The damp proof course DPC is generally applied at basement levels, which restricts the movement of moisture through walls and floors. The selection of materials for the damp proof course and its various methods of applications in buildings is discussed. The materials commonly used to check dampness can be divided into the following three categories:.
The choice of material to function as an effective damp proof course requires a judicious selection. It depends upon the climate and atmospheric conditions, nature of the structure, and the situation where DPC is to be provided. The points to be kept in view while making selection of DPC materials are briefly discussed below:.
For DPC above ground level with wall thickness generally not exceeding 40 cm, any one of the types of materials mentioned above may be used. Cement concrete is however, commonly adopted material for DPC at plinth level, 38 to 50mm thick layer of cement concrete M15 mix serves the purpose under normal conditions. In the case of a damp and humid atmosphere, a richer mix of concrete should be used.
The concrete is further made dense by adding waterproofing materials like Pudlo, Impermo, Waterlock, etc. It is used to apply two coats of hot bitumen over the third surface of the concrete DPC.
For greater wall thickness or where DPC is to be laid over large areas such as floors, roofs, etc. The felts, when used, should be adequately bonded to the surface with bitumen and laid with joints properly lapped and sealed.
In parapet walls and other such situations, materials like mastic, asphalt, bitumen felts, and metal copper or lead are recommended. It is vital to ensure that the DPC material is flexible to avoid any damage or puncture of the material due to differential thermal movement between the material of the roof and the parapet. In cavity wall construction, like cavity over the door or window should be bridged by flexible material like bitumen felt, strips or lead, etc.
The desirable properties of DPC material are- A. It should be impervious. These DPCs look like fine sheets of material situated between the brickwork of a building near ground level and can also be referred to as damp proof membranes. The existence of damp wall defects can be hidden at times where tiled or timber clad internal walls exist. The other most common type of DPC comes in the form of a chemical rather than a physical barrier. Chemical DPCs can be made from a variety of different products and chemicals but tend to appear as gels or creams.
This is the type of treatment that your property may undergo if your damp proof membrane is damaged or missing, as introducing a new physical damp proof membrane can be difficult, time-consuming and expensive in comparison. Having discussed exactly what a damp proof course is, there is some key DPC-related terminology worth learning to stay fully aware of what is happening to your property. Here is a short guide to some phrases you might hear a damp proofing contractor say:.
Our team of experts will gladly visit you and provide a free and honest survey of your damp concerns, recommending the most efficient solution for your personal needs or requirements. Book a free survey today or get in touch on for bespoke advice tailored to you. As damp proofing and timber specialists, we routinely tend to properties with all manner of damp issues, including rising damp. In most residential construction the DPC is a minimum of mm above ground level to exclude moisture seepage from the surrounding ground.
Water is blocked from rising into walls and timber frames, which would otherwise result in rot and rising damp.
In many older properties where the original DPC has deteriorated, or was not installed, the fix for this was to have a professional contractor inject chemicals into the walls.
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