Dormer Assembly Base Frame Flap Integration for Watertight Roof Transition
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Solution Overview
Problem
The installation of dormer assemblies in pitched roofs often compromises the water tightness and thermal insulation of the roof, and existing methods are not easy to perform effectively.
Innovation Solution
A method involving a base frame with attached flaps from the underroof, insulation material, and a series of trimmers and flashing systems to create a watertight and insulated transition, including the use of insulation frames, waterproof collars, and drainage gutters to manage rainwater and maintain insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hole is made in the roof for installation of a dormer assembly, then the dormer can be installed, but the water tightness of the roof is compromised
Solution Approach 1:
Flaps are pre-formed in the underroof material before dormer installation, and these flaps are folded and attached to the base frame members during installation to create integrated waterproofing. This preliminary preparation of flaps allows the waterproofing solution to be built-in during the installation process rather than requiring separate waterproofing steps after the hole is cut.
Solution Approach 2:
The flaps act as an intermediary element between the roof opening and the dormer assembly. By folding and attaching these flaps to the base frame members, they create a transitional waterproof barrier that connects the existing roof structure to the new dormer opening, preventing water infiltration at the interface.
2Ease of manufacture
If a hole is made in the roof for installation of a dormer assembly, then the dormer can be installed, but the thermal insulating properties of the roof are reduced
Solution Approach 1:
Flaps are pre-formed in the underroof material before dormer installation, and these flaps are folded and attached to the base frame members during installation to create integrated waterproofing. This preliminary preparation of flaps allows the waterproofing solution to be built-in during the installation process rather than requiring separate waterproofing steps after the hole is cut.
Solution Approach 2:
The flaps act as an intermediary element between the roof opening and the dormer assembly. By folding and attaching these flaps to the base frame members, they create a transitional waterproof barrier that connects the existing roof structure to the new dormer opening, preventing water infiltration at the interface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method ensures a watertight and insulated installation of dormer assemblies, improving both water tightness and thermal insulation while being relatively easy to perform, by using a combination of base frames, insulation, and flashing systems to manage rainwater effectively.
Implementation Method 1
placing insulation material having a lambda value below 0.1 w/mk, preferably below 0.04 w/mk, below the side members and between the battens for supporting the base frame
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
Method of installing a dormer assembly comprising a dormer cheek, an upper section and a lower section, in a pitched roof comprising an underroof, rafters and/or battens, wherein the sections are adapted to adjoin the dormer cheek, the pitched roof and the opposite section. The method comprises the steps of: mounting a base frame, comprising frame members, onto the rafters and/or battens, cutting a hole in the underroof, thereby creating flaps in the underroof extending along the frame members of the base frame, attaching the flaps of the underroof to the base frame members by folding the flaps.