Hilti

CP 605 Bottom-of-Wall Firestop Sealant

Bottom-of-wall firestop sealant · US · manufacturer-sourced

Check your container: This countdown is for the Bottom-of-wall firestop sealant variant. Similar-looking versions may have different times.

How long does Hilti CP 605 Bottom-of-Wall Firestop Sealant take to dry?

Short answer

Tack-free: 15 minutes after application.
Firestop sealants

Firestop cure plan

A skin is not a cure, and depth sets the pace

  1. Install the Bottom-of-wall firestop sealant to the tested system
  2. Leave it undisturbed through the skin stage
  3. Wait for full cure before painting or inspection

This product’s stated stages Quoted at 73°F and 50% humidity

  • Tack-free15 minutes

Worth noticing: The manufacturer states only one timing here (tack-free, 15 minutes); nothing else is inferred.

Common mistake: Painting or covering a firestop that has skinned but not cured through.

Firestop sealants

Bond-strength path

Assembly, handling and full load are different stages

1 · AssembleClean, fit and apply the Bottom-of-wall firestop sealant version correctly.
2 · HoldKeep the joint undisturbed through its set or clamp stage.
3 · LoadUse full cure—not surface firmness—before demanding use.

Time the firestop cure

When was the sealant installed?
Conditions that affect drying
Where?
Thickness

Stated times

  • Tack-free15 minutes

From Hilti product page · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.

Manufacturer website: hilti.com

Conditions & fine print
  • Stated conditions: 73°F (23°C) and 50% relative humidity
  • Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.
  • Temperature range: 35°F to 104°F
  • Region US. Formulas can differ between countries; check your container.
  • Tack-free: At 73°F (23°C). 50% relative humidity.
  • Entered from the cited manufacturer documentation. Check the current label for the exact formula and region. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Confirm this is your product

Closely named formulas, colors and regional versions can use different times. Match these details to your container before starting a countdown.

Exact listing
Hilti CP 605 Bottom-of-Wall Firestop Sealant
Variant
Bottom-of-wall firestop sealant
Region
US
Listed use
firestop at wall bottoms, head and base of wall
Timed stages recorded
tack free
Source checked
2026-10-25

Documentation: Official product page · Product page document, marked 03/22

Condition attached to the stated time: At 73°F (23°C). 50% relative humidity.

About this product

A sealant made for the bottom of a wall assembly. The page gives a 15 minute tack-free time and a cure rate of 3 mm in 3 days at 73°F and 50% relative humidity, which is slower per day than many general firestop sealants.

Using this specific product

Hilti CP 605 Bottom-of-Wall Firestop Sealant is listed here as the Bottom-of-wall firestop sealant version for firestop at wall bottoms and head and base of wall. For sealing a firestop opening, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.

Before you start

  • Confirm the package says Bottom-of-wall firestop sealant; related versions can use different timing.
  • For firestop at wall bottoms and head and base of wall, pay particular attention to temperature, joint depth, humidity and the thickness of the bead.
  • At 73°F (23°C). 50% relative humidity.

How to check readiness

Confirm the sealant is tack-free and cured to depth before the opening is inspected or the area is closed up. The page lists a tack free time of 15 minutes.

Avoid this mistake

Tack-free is only the surface; the rated seal depends on the full depth cure shown on the sheet.

Compare with similar products

Keep going

Questions

How long does this product take to dry?

Hilti states: The page lists a tack free time of 15 minutes. Conditions: At 73°F (23°C). 50% relative humidity.. These are the manufacturer’s stated times, not a guarantee.

How fast does CP 605 cure in depth?

The page lists an approximate cure time of 3 mm in 3 days at 73°F (23°C) and 50% relative humidity.

What affects how long this product takes to dry or cure?

Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet. Follow the product label for your conditions.

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All firestop sealants