Construction Fillers
Construction Fillers: Seal, Fix and Finish with Confidence
When gaps, cracks and joints threaten to derail your project’s polish, Construction Fillers from Blacktown Building Supplies step up. From expanding foam to acrylic sealants and multi-purpose gap fillers, our curated range of high-performance products helps you finish strong, whether you’re framing walls, insulating panels or prepping for paint.
We stock trusted names like HB Fuller and Sika, with options tailored for interior, exterior and specialised construction use. Whether you’re sealing behind skirting boards, filling cavities around window frames, or smoothing out joints in plasterboard, we’ve got the filler to get it done.
Looking for gap fillers or expanding foam for internal walls, or construction sealants for tough outdoor conditions? Browse our full range of construction sealers and fillers, all in stock and ready to go.
Flexible Foam and Acrylic Fillers That Work Where You Do
Our range includes:
- Expanding polyurethane foams ideal for cavity fill and insulation
- Paintable acrylic gap fillers for neat, smooth finishes
- Flexible sealants with excellent adhesion on timber, masonry, and drywall
- Purpose-formulated products for bathrooms, kitchens, and moisture-prone zones
And with sizes from 300ml tubes to 750ml canisters, we cater to both small repairs and high-volume trade jobs.Â
Ideal for Internal Trim, Windows, Doors and More
Construction fillers are essential when installing:
- Interior trim timber like architraves and skirting
- Timber skirting boards or decorative mouldings
- Pre-hung doors, windows, and cabinetry
- Wall and floor mouldings for commercial or residential builds
Pair them with our timber mouldings and skirting boards for a pro-level finish from the ground up.
Why Buy Construction Fillers from Blacktown Building Supplies?
We’re more than just a supplier, we’re a trusted trade partner with decades of experience working alongside builders, chippies, and contractors across Sydney. Our product range is selected for performance, compatibility and ease of use.
At Blacktown Building Supplies, we stock a wide range of construction fillers from trusted brands like HB Fuller and Sika. Whether you’re patching up plasterboard, sealing expansion gaps, or working on detailed cabinetry, you’ll find reliable products backed by expert advice. Our team is here to help, so if you’re not sure which filler is right for your substrate or application contact us.
Need help choosing the right construction filler? Speak with our team for tailored advice on application types, drying times, or compatibility with timber and cladding. Or simply order online and get your project sealed, filled, and finished