How Long Does Mortar Take To Cure?

How long does it take Mortar to heal?As construction projects progress, it can be exciting to get to the final stage. Apply finishes to newly remodeled or refurbished surfaces for an eye-catching aesthetic. Plastering bricks or other constructions, adding the final layer of polish to all your hard work. Just like concrete, mortar requires careful planning and execution to ensure you achieve ideal curing strength and a solid finish. Let’s take a closer look at what affects the curing time and strength of different grouts.



Mortar… Mortar, What’s the difference?


Mortar is a mixture of sand, water, lime and cement. It is used to bind heavy materials together (such as brick and stone) and provide structural integrity. It can also be used for thinner materials (such as bricks) to create a bond between the brick and the substrate. Mortar has a lower water content than grout and should only be used with just enough water to make the grout smooth and viscous.

Glue scrub

Grout is a pourable paste used to fill crevices or gaps between bricks, used after the grout has set. It has a higher water content than mortar so it is easier to putty. Due to its thinner nature, grout is not a suitable substitute for grout.


There are different types of grout and each is ideally suited for different applications. Each cure has a different compressive strength and should be carefully selected to ensure your grout matches the curing strength you need.


Thinset mortar is also known as dry setting mortar or dry bonding mortar, It contains water retention additive which aids in curing and hydration. It is used most often for tiles and counter tops. Thinset mortar takes 24-48 hours to cure. Thinset is available in a wide range of blends that can be used for a variety of tiles and materials. Each type of tile has different curing strength requirements, so make sure to choose the right grout mix for your tile selection.

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Brick mortar

Brick mortar is made from Portland cement and is used for more structural and load-bearing works. It will reach 60% strength within the first 24 hours and it will take up to 28 days to reach full healing strength. There are 5 types of brick mortar, and they are all treated differently.Powerblanket . mortar fire time graphic

US Type

Type M grout has a minimum strength of 2500 psi and is the strongest grout. It is used for constructions that need to withstand extreme gravity and large lateral loads.


Grade S grout is a medium strength grout that can withstand a minimum compressive strength of 1800 psi. It is commonly used on exterior walls, patios, paving and other projects where the grout is in direct contact with the ground.

Female Type

Type N grout is a general purpose, general purpose grout that cures to a minimum strength of 750 psi. This type of mortar is often used for general construction works and for the reinforcement of interior walls.

Type O

Type O is a low strength grout that cures only to a minimum compressive strength of 350 psi. It is only safe to use on non-load-bearing interiors, exterior (non-structural) repairs, or on soft masonry such as sandstone or brownstone.


Type K is the lowest strength grout available and has a very limited use. It only cures at 75 psi minimum strength so it is mainly used for historical preservation. It is not used for anything structural or load bearing due to its low curing strength. TIME IS FINALMortar will usually cure to 60% of its final compressive strength within the first 24 hours. It will then take about 28 days to reach the final healing power. However, the maintenance process does not always follow a common timeline. There are several key environmental factors that affect the curing time of your grout. Ambient temperature, air flow, amount of water used in your mix and humidity all affect the curing time of the grout.Powerblanket infographic on mortar curing time

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According to leading concrete manufacturer TCC Materials, “normal temperatures are between 40°F-100°F (4.4°C-37.8°C). Then cold weather occurs when the ambient temperature drops below 40°F (4.4°C)”. When you work within the normal temperature range, you can expect your grout to follow a typical curing timeline. “Cold weather can slow down the application process by affecting the setting time and strength development of mortar and grout. If the weather drops below 40°F (4.4°C) within 24 hours for grout and 24-48 hours for hydrated grout, the cement will stop until the temperature becomes warm enough to continue. hydration. “Waiting for warm weather isn’t always ideal or even possible when you’re on schedule with construction. Using a curing blanket to protect your screed during curing can help keep you on track and help your screed cure at maximum strength.


The chemical curing process depends on the mixture being hydrated. High winds and fans strip away the moisture needed by the grout for proper moisturizing and curing. For interior grouting jobs, consider turning off the fan which may interfere with the curing process. For exterior work, you will need to protect your screed from high winds and possibly add moisture as the grout sets to reduce cracking. Most grout manufacturers will provide rehydration instructions for their specific products.


Be sure to carefully follow the grout manufacturer’s instructions for mixing ratios. Your mixture should contain only a defined amount of moisture. Too much or too little water not only changes the curing time and curing strength of the mortar, but also makes it difficult to apply.

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Maintaining proper humidity is critical to healing time and ultimate durability. That means even the humidity in the air needs to be monitored. If you are building under very low humidity, you may need to add moisture to your grout to aid in the curing process. Working in high humidity conditions can increase the curing time of the grout, but you will need less moisture curing.

Settings vs. Healing

Although the grout won’t cure completely, it won’t be long before the grout will set enough for you to move on to the next steps. After 24-48 hours, depending on the humidity and ambient temperature, you can start grouting. POWERBLANKET’S SHORT-TERM SOLUTION

Concrete curing blanket

Few can limit heat-sensitive work to warm-weather days. Thanks to Powerblanket, there are no expensive out-of-season costs and grout work can continue all year. Our concrete curing blanket can cure 2.8 times faster than conventional insulation blanket. We can safely insulate your grout and protect it from heat and moisture loss during the curing process. Contact us today at 855.447.9358 or [email protected] to find the perfect curing solutions for your grout needs.

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