Reinforced Mull Post Assembly for Hurricane Resistance
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Solution Overview
Problem
Traditional mull posts, whether made of solid wood or extruded polymer, are vulnerable to deflection, bending, and impact from high winds and airborne debris, compromising the integrity of entryway systems in coastal regions, and fail to meet stringent building codes for hurricane-prone areas.
Innovation Solution
A reinforced mull post assembly featuring a two-piece housing with interlocking flanges and a central chamber containing a reinforcing member, comprising engineered wood and durable materials connected by a glued finger joint, providing enhanced strength and rigidity while maintaining a traditional wooden appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional solid wood mull posts are used, then the appearance is traditional and aesthetic, but they are vulnerable to deflection and breaking under high wind pressure and debris impact
Solution Approach 1:
The mull post combines multiple materials: an extruded polymer housing (PVC or other durable polymer) provides corrosion resistance and structural framework, while engineered wood reinforcing members (such as LVL - laminated veneer lumber) provide tensile strength and impact resistance. This composite construction allows the mull post to withstand hurricane-force winds and debris impact while maintaining the traditional wooden appearance through the engineered wood components that can be finished to match surrounding architectural elements.
2Strength
If extruded polymer mull posts are used, then they are resistant to breaking and splitting, but they are highly susceptible to deflection and bending under high pressure
Solution Approach 1:
The extruded polymer housing provides corrosion resistance and structural framework, while engineered wood reinforcing members (such as LVL - laminated veneer lumber) provide tensile strength and impact resistance. This composite construction allows the mull post to withstand hurricane-force winds and debris impact while maintaining the traditional wooden appearance through the engineered wood components that can be finished to match surrounding architectural elements.
Solution Approach 2:
The mull post is divided into multiple functional segments: the extruded polymer housing forms the outer shell and structural framework, while separate engineered wood reinforcing members are positioned within the housing to provide specific structural support. This segmentation allows each material to perform its optimal function - the polymer provides corrosion resistance and the engineered wood provides tensile strength - while together they create a unified structure that resists both breaking and deflection.
3Ease of manufacture
If traditional wood mull posts are used in coastal regions, then they can be finished to match traditional architecture, but they fail to meet stringent building codes for hurricane-prone areas
Solution Approach 1:
The mull post combines multiple materials: an extruded polymer housing (PVC or other durable polymer) provides corrosion resistance and structural framework, while engineered wood reinforcing members (such as LVL - laminated veneer lumber) provide tensile strength and impact resistance. This composite construction allows the mull post to withstand hurricane-force winds and debris impact while maintaining the traditional wooden appearance through the engineered wood components that can be finished to match surrounding architectural elements.
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 reinforced mull post assembly effectively resists deflection and impact, meeting stringent building codes by combining the strength of engineered wood with durable materials, ensuring the integrity of entryway systems in coastal regions.
Implementation Method 1
the portion of the reinforcing member in the longitudinal void section including an upper wood portion and a lower durable portion, connected end to end by a glued finger joint
Data Source
AI summary
A composite reinforced mull post is disclosed for use in an entryway assembly. The mull post may engage a door on one side and a side light window on the other side. The mull post may comprise a one or two-piece outer portion and one or more internal reinforcing members. The outer portion may comprise a plurality of interlocking pieces. A first internal reinforcing member may be formed of engineered material such as a wood laminate, and a second reinforcing member may comprise a channel that extends partially around the first reinforcing member. The reinforcing member may include orthogonal portions conterminously received within a correspondingly shaped central chamber formed by the housing formed by the joined interlocking pieces. The reinforcing member may include an upper wood portion and a lower durable portion, connected end to end by a glued finger joint.