Faded uPVC in Plymouth: sealant selection
Sealants, joints and movement capability in Plymouth. Ask what sealant grade we are specifying and why — it should always be a considered answer.
Ask what sealant grade we are specifying and why — it should always be a considered answer.
Perimeter joints are structural in the weatherproofing sense. A sealant is chosen for movement capability, adhesion to both substrates and resistance to ultraviolet light, and those three requirements often rule out whatever is cheapest on the shelf.
Faded uPVC Plymouth: sealant selection
Joint geometry decides longevity as much as the product does. A sealant bead needs depth as well as width and a backing rod to prevent three-sided adhesion; smeared thin over a wide gap, even the right product will fail.
Faded uPVC Plymouth: sealant selection
Usually the wrong product or the wrong joint geometry. A rigid filler in a moving joint, or a bead with no depth behind it, will let go however neatly it was applied.
Sealants, joints and movement capability in Plymouth
Perimeter joints are structural in the weatherproofing sense. A sealant is chosen for movement capability, adhesion to both substrates and resistance to ultraviolet light, and those three requirements often rule out whatever is cheapest on the shelf.
Low-modulus neutral-cure silicone handles a moving joint without tearing away from the masonry. Acrylic-based fillers, by contrast, harden and split at the first real thermal cycle, which is why so many joints fail within a couple of seasons of being redone.
Joint geometry decides longevity as much as the product does. A sealant bead needs depth as well as width and a backing rod to prevent three-sided adhesion; smeared thin over a wide gap, even the right product will fail.
Faded uPVC Plymouth: sealant selection
- Faded uPVC in Plymouth: Why did the last resealing job not last? — what matters for 1950s post-war terraces in Devonport?
- Usually the wrong product or the wrong joint geometry. A rigid filler in a moving joint, or a bead with no depth behind it, will let go however neatly it was applied.
sealant selection decision path for Faded uPVC in Plymouth
Low-modulus neutral-cure silicone handles a moving joint without tearing away from the masonry. Acrylic-based fillers, by contrast, harden and split at the first real thermal cycle, which is why so many joints fail within a couple of seasons of being redone.
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