Mastic sealing for building owners and managing agents

What mastic sealing for building owners and managing agents covers

For anyone looking after blocks of flats, mixed-use buildings or commercial portfolios, failed mastic tends to arrive as a stream of separate reports: water at a window here, a draught there, a stained ceiling in a stairwell. Dealing with each one in isolation costs more over time and leaves the building with a patchwork of different products and ages of sealant. We work with building owners, landlords, managing agents, property factors and housing associations on mastic sealing across communal areas and building exteriors. That includes window and door perimeters on blocks, external joints, communal entrances, and resealing failed mastic across a whole building or estate. We can price individual repairs, but the better value is often a block-wide or planned maintenance programme, scoped from an inspection of the joints, so failed mastic is replaced in one go and the next inspection has a clear starting point.

We work across South East England, Greater London and all of Scotland. Our workmanship carries a 12-month guarantee, we’re CHAS accredited and a Constructionline member, and our applicators hold CSCS cards.

Problems we put right

• Failed mastic around windows across a whole block
• Water reports from residents after heavy rain
• Old mastic that has hardened, cracked or gone black
• Repairs done piecemeal, one flat at a time
• Communal areas that look neglected
• Planned maintenance budgets that need a clear scope

Joints and areas we seal

• Window and door perimeters on blocks
• Communal entrances and stairwells
• External wall and movement joints
• Balcony and threshold joints
• Communal kitchens and washrooms
• Shopfronts below residential blocks

Why it’s worth doing now

Across a block or estate, failed mastic around windows, doors and external joints leads to draughts, water ingress and damp complaints from residents. Dealing with it as one planned programme costs less than reacting flat by flat, and gives a clear record of what was done and when.

What affects the quote

We don’t publish set prices, because no two buildings are the same. Send details and we’ll give you a fixed quote before we start. The main things that affect it are:

• How many metres of joint there are, and how many areas, elevations or sites
• How much failed sealant has to come out, and how hard it is
• Joint size, depth and whether backing rod or primer is needed
• Access: height, scaffold or MEWP access arranged by others, occupied areas
• The product the joint needs (and colour, where it matters)
• Programme, phasing and site requirements such as permits and inductions

What a good quote includes

• All failed sealant removed, never sealed over
• The product named for each joint type
• What the 12-month guarantee covers
• When each area can be used again
• Who is doing the work, their CSCS cards and the insurance in place
• What site paperwork and records are included

Aftercare

Build a mastic inspection into your cyclical maintenance and keep a schedule of which elevations were resealed and when. Ask residents to report water at frames promptly, and check joints after any window, cladding or roofing work on the building.