Seal screed - instructions

Seal screed - instructions: floor

Why seal screed?

If you want to seal a screed, you are either concerned with resilience or visual enhancement. Depending on which end result is desired, there are several sealing options that you can find here.

Seal screed - instructions

You want to protect your cellar or garage floor against ingress of liquids and moisture? Or from the simple subsoil by sealing produce a floor in living quality? How and with what you can seal or coat screed, you will learn in this guide.

There are generally different approaches. From a complex two-component epoxy resin sealer over various dispersions to waxes and oils. In advance, it is important to know which properties and which optics can be achieved by the respective materials and how the processing and subsequent care is represented.

If you need a robust, non-sensitive floor that is waterproof and very firm, for example, the following information is just as much a decision as the one looking for a modern exposed concrete look with a natural feel.

Craftsmanship demanding procedures should only be carried out by DIYers with the appropriate experience and knowledge or a specialist company.

How can screed be sealed?

Basically, any screed can be sealed, apart from a dry screed bed. No matter whether it is a floating screed, poured asphalt screed, finishing screed or a garage floor screed. A floating screed will definitely be sealed in such a way that there are no bridges at the edges.

materials

kind

properties

2K sealers (Epoxy resin or similar)

or also one-component polyurethane resin

impregnation

  • Dirt and water repellent
  • harmful vapors during processing
  • So sealed screed is very easy to clean
  • non-porous surface
  • haptic rather unnatural
  • strong shiny *
  • colorable
  • can be used as a transparent coating
  • has a balancing effect
  • well suited to screed seal in the living room
  • ideal also for screed sealing outdoors
  • Wear protective clothing, goggles and respiratory protection

Special plastic dispersions

  • z. B. Acrylic-based seal or dispersion bottom seal

impregnation

  • Dirt and water repellent
  • Easy to maintain
  • opaque surface; to the screed seal in basement, garage, etc. less in the living area
  • usually less hard than 2K coatings
  • matt and glossy available in many colors
  • compensates no bumps

Silicone fluorides or fluorosilicates

silicification

  • very firm and waterproof
  • easy to care for
  • haptic like terrazzo or smooth stone
  • extremely durable
  • very elaborate grinding work
  • transparent
  • compensates no bumps (also unnecessary in the finish)
  • Water glass is highly alkaline - Wear protective clothing, goggles and respiratory protection

acid-free oils

Oil

  • Water repellent
  • must always be re-oiled
  • Grease film on the surface
  • haptic of course
  • something shiny
  • transparent
  • compensates no bumps
hard waxes

Waxing, polishing

  • Dirt and water repellent
  • Care: regrowth, outgrow in longer distances and grow and polish new
  • non-porous surface
  • haptic relatively natural
  • matt gloss
  • transparent
  • compensates no bumps

* There are complementary products to make the coating duller and more non-slip, such as matting dispersion for epoxy coatings or concrete paint.

Which preparation of the screed is necessary?

The hard screed floor must first be sanded with a suitable grinding machine and a special star grinding wheel. Single-disc machines you can borrow in some hardware stores.

Seal screed - instructions: floor

The screed to be sealed should be clean and free of cracks.

With a two-component epoxy resin or polyurethane sealant, the screed does not necessarily have to be sanded very finely. As with the resin of the substrate can be compensated or at least provided with a continuous, non-porous layer. For this a multiple order is necessary.

Since a plastic dispersion (floor paint) usually only comes into consideration in utility areas such as garages or basements, it must not be excessively sanded before painting - depending on personal requirements.

For all other seals, the cut also contributes to a denser surface. Especially before silicification, the surface should be ground extremely fine. Also for sealing with oils or hard waxes, with which the screed is completely saturated and possibly then polished dry.

Cracks and damage in the screed should always be repaired before any kind of sealing (suitable filler, eg epoxy crack repair) and sanded. A fat and dust-free as well as completely dry surface is just as important if the seal is to succeed.

Remember, some types of screed may take up to 30 days to dry completely. Caution is required for information on readiness for sale. That is not synonymous with completely dry. Please read the information provided by the manufacturer and / or, to be on the safe side, please inquire to avoid later damage.

How is the screed sealed?

Two-component resins consist of a resin and a hardener. For example, if you use epoxy resin for screed sealing outdoors, then the screed will be really waterproof. Resin and hardener, however, must be weighed exactly and mixed together well before being applied. The relatively liquid mass is poured onto the screed and spread with a smoothing trowel o. Ä. In any case, read exactly the instructions for use and the manufacturer's data sheet and pay close attention to them.

Carefully: When applying an epoxy resin floor coating, it is essential to wear protective clothing, gloves, goggles and respiratory protection and ensure that there is sufficient ventilation so that you are not directly exposed to harmful vapors or the like. Also pay attention to the processing times.

Special plastic dispersions (For example, concrete paint, floor paint, etc.) you can paint on the edge with a brush and on the surface with a floor roller (paint roller handle and floor roller made of nylon) on the screed or roll. Usually two coats are required. Please observe the manufacturer's instructions for use and the drying times on the packaging.

The liquid to silicification (For example, with potash water glass) of the surface by silicone fluorides or fluorosilicates can usually be brushed, rolled or sprayed. Protective clothing, gloves and goggles as well as respiratory protection during spraying are advisable as the liquid is just as alkaline as ammonia. Please work according to the instructions and follow all instructions of the manufacturer for processing and protection.

At the Oil With acid-free oil (eg stone and concrete oil), the surface, which is as smooth as possible, is soaked in oil until saturated. Remains are removed with towels again. The result is a thin film of grease that protects the surface against the ingress of liquids. When oiling, the instructions and instructions for use on the packaging should be carefully observed.

When sealing with a Hard Wax, Especially suitable for screed, it depends very much on the consistency of the hard wax. For hard wax oils, oiling is carried out as previously described. When using stone wax or antique wax (eg hard wax solid), the solid wax block must be heated and worked into the material like a polish - either by hand or with a polishing machine. Then polish to get a still water-repellent floor coating. Waxed screed is waxed if necessary and gets over time a noble patina.

In addition, there are still numerous products with different mixtures, such as polymers stone impregnation.

Author: Christiane Baldwin

Photo Credits:
  • Cover picture: Pixabay / rawpixel
  • Screed: Riccardo Düring

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Video Board: How to seal a concrete garage floor with PVA Part 1