Does this look familiar to you? Broken fence, rotten, wind damaged fence posts? You may want to repair it or save time and effort building a brand new fence. In both instances, Sika Post Fix is the product that fundamentally changes the way people can install or repair their fence.

Sika Post Fix is a two-part, pre-proportioned polyurethane resin which when mixed produces an expanding foam. It has been specifically formulated and packaged to provide a lightweight, mix-in-the-bag, fast-setting and high-strength backfill for wooden, PVC and steel in-ground supports. Sika Post Fix is based on Sika’s proven foam technology and designed for easy, convenient and quick support of many types of post.

The Concept

Sika® Post Fix is an expansive polyurethane foam specifically formulated and packaged to provide a lightweight, mix-in-the-bag, fast-setting and high-strength material for installing fences and other in-ground supports.


  • Easy to Handle: Equivalent to 2 bags of 30 kg of cement post mix
  • Easy to Mix: In-bag mixing – No tools, no water required. Rub pouch for 20 seconds along a rounded edge (or your leg) to blend contents. DO NOT EXCEED MIXING TIME!
  • Easy to Place: Set all types of posts in 3 minutes (wood, steel, PVC)

Sika® Post Fix expands in all directions and adheres to virtually anything in the ground


Concrete does not expand into cavities in the substrate



  1. Dig the hole (remember to check for water mains and gas lines first!)
  2. Place and level the post in the hole
  3. Mix Sika® Post Fix – In bag mixing 20 seconds max
  4. Pour Sika® Post Fix in the hole making sure to coat the faces of the post
  5. Hold the post still for 3 minutes either manually or using a bracing device (1×4 strapping)
  6. The fence will be ready to be installed after 2 hours

Tools required


Tools needed: utility knife, scissors, safety goggles, gloves, measure tape, level

Tools you won’t need

Wheelbarrow, shovel, trowel, buckets, concrete mixer, hose and a water line… Not to mention enlisting friends and family members for the operation! Just invite them over to enjoy the backyard once the job is completed!

Where to use Sika® Post Fix?

  • Fence and Gateposts
  • Mailbox posts
  • Signage posts
  • Flagpoles
  • Garden light postsSika® Post Fix is suitable for use with all wooden, PVC and steel posts.

Let’s talk performance…

Sika® Post Fix is solid as Concrete. Thanks to its ability to expand in all directions in the hole and adhere to virtually anything in the ground (rocks, roots, etc.), Sika® Post Fix offers an excellent pull-off resistance and will perform equally as well as — if not better than — concrete. For replacing posts, it is far easier to work with than concrete.


Sika Post Fix is Solid as Concrete! (results after 2 hours)

Sika® Post Fix yield

Here’s a quick and easy tool to help you calculate the number of bags you will require for your project.


comparison vs concrete


Sika® Post Fix: One 979 mL pouch yields approx. 20 L (0.7 ft3) of expanded foam. Let’s take a standard 25-post fence job, your project will require:

  • 50 bags of concrete mix (count 2 bags of concrete mix per post)
  • 25 posts x 60 kg (2 x 30 kg/post) which adds up to 1.5 ton of concrete mix
  • Ability to haul

Before you Start

Some useful tips for a successful fence-building or repair project:

  1. Check your local Building Code for frost depth in your area (it will determine the depth of the holes)
  2. Read the product data sheet and directions on the packaging before starting
  3. Product temperature: Sika® Post Fix temperature must be between 18 – 25°C for at least 2 hours before using (keep in mind that the average temperature of a garage slab is 14°C, if your material is stored directly on the ground, it will be at the same temperature… 14°C! notice that 4 degrees make the whole difference in terms of product performance)
  4. Make sure the holes are free of standing water: If there is standing water in the hole, backfill partially with soil or gravel until water is no longer visible or pump the water out
  5. Respect the 20-second mixing time
  6. Don’t move the posts beyond the first 10 seconds following the initial pour (don’t hesitate to use a bracing device to immobilize the post in the hole)
  7. Be prepared to work fast: Wear your safety gear (gloves and safety goggles), have the post already positioned in the hole, have all your tools ready and avoid distractions: the product works quickly once you’ve started the mixing process.