EXPERT SOLUTIONS FOR DAMP, TIMBER & BASEMENT WORKS

TRUSTED BY CONTRACTORS & PRESERVATION SPECIALISTS

  • Trade Quality Products

    Trusted by professionals nationwide

  • Same-Day Dispatch Available

    For orders placed before 3PM

  • Specialist Technical Support

    Expert help when you need it

  • Up to 30-Year Guarantees Available

    For BIOKIL. Approved Contractors ONLY

Mapei  |  SKU: 177142

Mapei Idrostop Mastic – 300ml

Regular price £212.65
Pack

Customer Services

Got a query? Call 0330 055 8210

We're open from 8am to 5pm, Monday to Thursday, and 8am to 4:30pm on Friday.

Delivery and Shipping

Delivery is £12.50 + VAT to UK Mainland. Orders over £100.00 + VAT qualify for free delivery, except for certain products—these will be clearly shown at checkout.

Orders placed by 3pm (stock permitting) are dispatched the same working day on a next working day service (not guaranteed).

Some areas, like Northern Scotland, may take 2–3 working days.

Deliveries outside the UK Mainland are charged at cost—please contact us.

We're open:
Mon–Thurs: 8am–5pm
Friday: 8am–4:30pm

Call us: 0330 055 8210

Mapei Idrostop Mastic – Silylated polymer adhesive for bonding Idrostop waterproof joint profiles

Idrostop Mastic is a one-component thixotropic adhesive made from silylated polymers, with high initial tack and rapid final hardening. It is used to bond Idrostop when making waterproof work joints in the civil, industrial and hydraulic construction sectors. Solvent free with no unpleasant odour, it has very low VOC emissions (EC1 R Plus) and sets by reacting with moisture in the air to form a plastic bead.

Key features

  • High initial tack and rapid final hardening
  • Adheres to slightly damp surfaces, provided they are clean and sound
  • Creamy consistency compensates for slight unevenness in the substrate
  • Adheres to cement-based surfaces, metal and plastic
  • Solvent free; EC1 R Plus very low emission

Typical applications

  • Bonding Idrostop to concrete between foundation slabs and vertical walls before second pours
  • Bonding Idrostop around PVC and steel pipes before pouring concrete

Available options

  • Box of 12

Technical information

Property Value
Type One-component thixotropic silylated polymer adhesive
Application temperature +5°C to +35°C
Concrete pour After 24 hours
Pack 300 ml cartridges with pre-cut triangular nozzle; boxes of 12

Limitations

  • Do not apply if the bonding surface is highly contaminated with acid or solvent
  • Do not use below +5°C or above +35°C
  • Remove oil, grease, wax and cement laitance first; lightly sand plastic surfaces

Health and safety

Read the safety data sheet before use. Always test adhesion and compatibility on a small area before full application.

Download the Mapei Idrostop Mastic technical data sheet (PDF)

Download the Mapei Idrostop Mastic safety data sheet (PDF)

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Maestro
  • Mastercard
  • PayPal
  • Shop Pay
  • Union Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.