How To Prevent Wind & Rain Getting Under Your Doors

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Preventing Water Ingress and Wind Under Doors with a Damp Proof Membrane.

Ensuring a well-sealed threshold is crucial to prevent water ingress and wind from entering under doors. One effective solution involves lapping up a damp proof membrane (DPM). This technique is widely used in construction to create a barrier against moisture, protecting homes from dampness and drafts.

Understanding the Problem

Doors, especially external ones, can become weak points in a building's envelope, allowing wind and rain to penetrate. Poorly fitted thresholds or insufficient sealing can lead to water seeping under the door, causing damage to flooring and leading to uncomfortable drafts. A damp proof membrane acts as a protective barrier, preventing these issues by blocking the pathways for water and air.

How Lapping Up a Damp Proof Membrane Works

A damp proof membrane is typically a polyethylene sheet placed beneath flooring to stop moisture from rising into the structure. In the context of door thresholds, the membrane is extended—or lapped up—around the edges and brought up the sides of the doorframe. This creates a continuous barrier that extends vertically from the subfloor to above the floor level, covering any potential gaps through which water or wind might enter.

Steps for Installation

Preparation: Ensure the surface beneath the door is clean and level. Cut the membrane to size, leaving enough material to extend up the walls and sides of the doorframe.

Laying the Membrane: Position the membrane to cover the entire subfloor area beneath the door and extend up the sides. Use adhesive or mechanical fasteners to secure the membrane in place, ensuring it adheres well to the underlying surface.

Sealing and Finishing: Use sealant or tape to secure the membrane where it laps up the walls and doorframe, ensuring no gaps are left. This step is crucial to prevent any pathways for water or air infiltration.

Benefits of Lapping Up the Membrane

Lapping up a damp-proof membrane not only prevents water ingress but also acts as an air barrier, reducing drafts. By creating a continuous, sealed barrier, it ensures that external elements cannot compromise the indoor environment. This method is particularly effective in areas prone to heavy rain or strong winds, providing long-lasting protection and enhancing the building's energy efficiency.

Incorporating a lapped damp-proof membrane under door thresholds is a proactive measure to guard against water ingress and wind penetration. By sealing potential entry points, it maintains the integrity of the building’s envelope, protecting both structural elements and the comfort of occupants.

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#homeimprovement #doorfitting #frenchdoors

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