Polymeric Sizing and Mesh Construction Joint Seal
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Solution Overview
Problem
Existing sealing systems for construction joints, particularly around windows and doors, face issues with air and moisture leakage due to circuitous paths created by nails, screws, or staples, and self-adhering membranes often fail to maintain adhesion on various substrates, leading to imperfect seals.
Innovation Solution
A method using a liquid latex polymeric sizing compound with embedded mesh, where the sizing composition includes a waterborne styrene-butadiene polymer and additional additives, applied to construction joints to secure a weather-resistant seal without the need for fasteners, allowing for flexible application before or after exterior treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If self-adhering membranes are used to seal construction joints, then adhesion to substrates is improved, but reliability deteriorates because they become unstuck or wrinkle on selected substrates in selected conditions
Solution Approach 1:
The invention uses a composite material consisting of an organic polymer adhesive combined with inorganic cementitious materials. This composite formulation provides both strong initial adhesion from the organic polymer and sustained bonding strength from the inorganic components, preventing the membrane from becoming unstuck or wrinkling on various substrates including concrete, masonry, and metal surfaces.
Solution Approach 2:
The invention modifies the chemical and physical parameters of the adhesive by incorporating water-reactive inorganic materials that undergo chemical changes upon exposure to moisture. This transformation from liquid adhesive to hardened cementitious bond creates a durable, weather-resistant seal that maintains reliability under varying environmental conditions.
2Reliability
If sequencing is required for tape application to properly shed water, then waterproofing is improved, but productivity deteriorates due to multiple sequential steps
Solution Approach 1:
The adhesive composition performs multiple functions simultaneously: it provides initial tack for immediate tape positioning, develops sustained bonding strength to prevent unraveling, and creates a weather-resistant seal. This multi-functionality eliminates the need for sequential application steps while maintaining reliable waterproofing performance.
Solution Approach 2:
The adhesive is formulated to provide immediate initial set upon application, allowing the tape to be securely positioned and bonded before subsequent weathering occurs. This preliminary bonding action prevents the need for sequential re-application or additional sealing steps.
3Reliability
If exterior treatments are applied over sealed joints, then weather resistance is improved, but adhesion deteriorates because sealing strips become unstuck before cladding is applied
Solution Approach 1:
The adhesive formulation includes inorganic materials that react with moisture from the air or subsequent exterior treatments to continue developing bond strength over time. This progressive strengthening provides a cushion against the adhesive failing before the exterior cladding is applied, ensuring the seal remains intact throughout the construction process.
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 solution provides a robust, waterproof, and flexible seal that maintains adhesion across various substrates, eliminating the need for sequencing in tape application and resisting weather for up to six months, even on minor surface discontinuities and low temperatures.
Implementation Method 1
a waterborne styrene-butadiene polymer adhesive
Data Source
AI summary
A method of sealing a construction joint is provided which comprises applying a polymeric sizing to the edges forming the joint, applying a mesh to the joint and applying a further coating of the sizing to said deposited mesh. The sizing material can comprise a styrene-butadiene latex, a filler and at least one of a colorant, an acrylic thickener, dispersant, biocide, defoamer, antifoamer, surfactant and an acid.