Heavy Weight Topsoil 70/30 Mix is a nutrient-rich soil blend made from approximately 70% screened topsoil and 30% green waste compost, designed for projects that require a dense, stable, and fertile growing base. This mix is heavier and more mineral-based than lighter garden mixes, making it ideal for grading, building up planting areas, mounds and establishing long-lasting soil structure while still providing essential organic matter for plant health.
It delivers the perfect balance between:
Structure (topsoil) for stability and compaction resistance
Nutrients (compost) for plant growth and soil biology
Common Uses
Soil for building mounds
Rough grading with improved soil quality
Building up general planting areas
Backfilling planter boxes and landscape zones
Soil improvement for poor native soils
New construction landscape prep
Why Choose a 70/30 Heavy Mix?
Unlike lighter mixes (like 50/50), this 70/30 blend holds its shape better, making it ideal when you need soil that:
Doesn’t settle excessively after installation
Provides better support for turf and landscaping
Handles foot traffic and light equipment
Maintains grade over time
It’s especially useful for contractors and large-scale landscape projects where consistency and durability matter.
Material Specifications
Composition
Blend Ratio: ~70% Screened Topsoil / ~30% Green Waste Compost
Topsoil Component: Native mineral soil with sand, silt, and clay
Compost Component: Recycled organic material (green waste, decomposed plant matter)
Material Characteristics
Color: Dark brown to earthy gray (varies by source and moisture)
Texture: Medium-heavy soil with visible organic matter (small wood fragments may be present)
Consistency: Dense, workable, and slightly clumpy when moist
Screening: Typically screened, but may contain small debris such as wood chips or fine roots
Performance Properties
Drainage: Moderate drainage (better than native soil, slower than sandy mixes)
Compaction: Good compaction for grading and base applications
Nutrient Content: Moderate to high (from compost content)
Water Retention: High — helps retain moisture for plant roots
What Makes it "Heavy Weight"
This mix contains a higher percentage of mineral soil, giving it:
Greater density and load-bearing ability
Reduced settling compared to lighter mixes
Better performance for grade building and structural landscaping
Important Notes:
Natural product — color, texture, and composition may vary
May contain small rocks, wood fragments, or organic debris (normal for bulk soil blends)
Moisture content can affect appearance and weight at time of delivery
Not a precision-engineered soil (not for spec projects, request engineered soil blends)
Coverage Guide & Ordering Information
Coverage Per Cubic Yard
Use this as a quick reference when planning your project:
1 cubic yard covers:
~150 sq ft at 2” depth
~100 sq ft at 3” depth
~75 sq ft at 4” depth
How Much Heavy Weight Topsoil do you need?
Basic formula:
Length (ft) × Width (ft) × Depth (ft) ÷ 27 = Cubic Yards
Example:
20 ft × 30 ft area at 3” depth (0.25 ft)
= ~5.5 cubic yards
Truck Load Size average
Small Dump Truck:
~7–8 cubic yards of soil blends
Best for tight access, driveways, residential deliveries
Large Dump Truck:
~35–40 cubic yards of soil blends
Ideal for large projects, contractors, and bulk orders
Delivery Notes
One material per load (no mixing different products)
Dump location must be flat, accessible, and clear of obstacles
Soil is delivered loose — expect a pile, not spread service
Moisture content can affect volume appearance at delivery
Free Delivery is offered on 10+ yards to select areas only.
We deliver Heavyweight Topsoil 70/30 soil blend mix through out Contra Costa county, Solano county, Alameda, and Marin county cities.
Pro Tip (contractor insight)
Order slightly more than calculated (7–10% extra) to account for:
Compaction
Minor grading adjustments
Waste or uneven ground
Frequently Asked Questions — Heavy Weight Topsoil 70/30 Mix
What is a 70/30 topsoil mix?
A 70/30 mix is a blend of approximately 70% screened topsoil and 30% green waste compost. It provides a balance of soil structure and nutrients, making it ideal for grading, lawn prep, and general landscaping.
How is this different from a 50/50 mix?
A 70/30 mix is heavier and more stable than a 50/50 mix:
Less settling over time
Better for grading and base layers
Slightly lower in organic content, but still nutrient-rich
50/50 mixes are lighter and better for planting-focused applications, while 70/30 is better for structure + support.
Is this good for growing plants?
Yes — it contains green waste compost for nutrients and supports:
Trees and shrubs
General landscaping plants
Planting mounds
For vegetables or delicate plants, consider adding a top layer of planting mix for optimal results.
Does this soil contain rocks or debris?
Yes — this is a bulk screened soil, not a fine sifted garden mix. It may contain: Small rocks. Wood fragments, Organic debris. This is normal and expected in landscape-grade soil.
