When selecting concrete for use between brick pavers, it’s crucial to focus on specific types and mixes that enhance permeability, strength, and compatibility with jointing materials. The ideal concrete for this purpose is typically a specialized mix known as ‘paver sand’ or ‘jointing sand’. This article will explore the best concrete options, application techniques, and considerations for filling the spaces between brick pavers.
What Are the Best Concrete Types for Paver Joints?
The most suitable concrete types for paver joints are:
- Polymeric Sand
- Jointing Sand
- Fine-grained Concrete Mix
Polymeric Sand
Polymeric sand is a popular choice for filling paver joints due to its superior binding properties. It consists of fine sand mixed with polymers that activate when exposed to water, creating a solid, durable joint filler.
Advantages:
– Excellent binding properties
– Resistant to weed growth
– Helps prevent ant infestations
– Reduces erosion of joint material
Disadvantages:
– More expensive than regular sand
– Requires careful application to avoid staining pavers
Jointing Sand
Traditional jointing sand is a more basic option but still effective for many paver installations.
Advantages:
– Cost-effective
– Easy to apply
– Allows for some flexibility in paver movement
Disadvantages:
– May wash out more easily than polymeric sand
– Less effective at preventing weed growth
Fine-grained Concrete Mix
A custom fine-grained concrete mix can be used for paver joints, typically with a ratio of 1 part cement to 3-4 parts fine sand.
Advantages:
– Can be customized for specific project needs
– Provides a solid, durable joint
Disadvantages:
– Requires more skill to mix and apply correctly
– Less flexible than sand-based options
What Mix Ratios and Aggregate Sizes Are Recommended?
For optimal results, consider the following mix ratios and aggregate sizes:
| Material | Mix Ratio | Aggregate Size |
|---|---|---|
| Polymeric Sand | Pre-mixed | < 1/8 inch |
| Jointing Sand | N/A (100% sand) | < 1/8 inch |
| Fine Concrete Mix | 1:3-4 (cement:sand) | < 1/8 inch |
The aggregate size should be small enough to fit easily within the joint spaces, typically less than 1/8 inch in diameter.
How Much Material is Needed for Paver Joints?
The amount of material needed depends on the joint width and the type of material used. Here’s a general guideline:
- For 1/4 inch joint width:
- Polymeric Sand: 1-2 pounds per 10 square feet
- Jointing Sand: 3-4 pounds per 10 square feet
To calculate the amount needed for your project:
- Measure the total square footage of your paver area
- Determine the joint width
- Use the above estimates to calculate the total amount needed
Example: For a 500 square foot patio with 1/4 inch joints using polymeric sand:
500 sq ft ÷ 10 = 50 x 1.5 lbs = 75 lbs of polymeric sand needed
What Are the Cost Implications of Different Joint Materials?
The cost of joint materials can vary significantly:
- Polymeric Sand: $3 to $5 per 50-pound bag
- Jointing Sand: $2 to $4 per 50-pound bag
- Fine Concrete Mix: Varies based on local cement and sand prices
For large projects, consider buying in bulk to reduce costs. Bulk purchases can often save 20-30% compared to smaller quantities.
What Are the Best Application Techniques for Paver Joint Materials?
Follow these steps for optimal application:
- Ensure pavers are clean and dry
- Spread the joint material evenly over the surface
- Use a broom to sweep the material into the joints
- Compact the material using a plate compactor or hand tamper
- For polymeric sand, mist lightly with water to activate the polymers
- Allow proper curing time (typically 24 hours for polymeric sand)
How Can Issues Like Cracking and Weed Growth Be Prevented?
To prevent common issues:
- Cracking:
- Ensure a stable, well-compacted base
- Use flexible joint materials like polymeric sand
-
Allow for proper drainage
-
Weed Growth:
- Use weed-resistant materials like polymeric sand
- Maintain joints by regular sweeping and occasional reapplication
- Consider applying a paver sealer for added protection
What Are the Optimal Curing Times and Environmental Conditions?
For best results:
- Curing Times:
- Polymeric Sand: 24 hours minimum
- Jointing Sand: No specific curing time
-
Fine Concrete Mix: 24-48 hours
-
Optimal Conditions:
- Temperature: 60-80°F (15-27°C)
- Humidity: Low to moderate
- Weather: Dry, with no rain forecast for at least 24 hours
Avoid application in extreme weather conditions such as heavy rain, direct sunlight, or freezing temperatures.
By carefully selecting the appropriate concrete or joint material and following proper application techniques, you can ensure durable, attractive joints between your brick pavers that will enhance the overall look and longevity of your paved surface.
References:
1. All About Concrete Pavers – This Old House
2. Brick Pavers vs. Concrete Pavers: Which is Right for Your Project?
3. Different types of paving materials – Perfect Pavers