Browse » home» Workshop Shed with Loft: 12x20 Plans

---

Workshop Shed with Loft: 12x20 Plans

Detailed Plans for a 12x20 Workshop Shed with Loft

This document provides comprehensive plans for the construction of a 12ft x 20ft workshop shed incorporating a loft storage area. These plans are designed to be detailed and informative, guiding a skilled builder through the entire process. While this document offers significant detail, it is crucial to consult local building codes and obtain necessary permits before commencing construction. Safety precautions should be observed at all times throughout the building process.

I. Foundation and Site Preparation

The foundation is the critical first step in ensuring a stable and long-lasting structure. The choice of foundation will depend on several factors, including soil conditions, local regulations, and the intended use of the shed. For a 12x20 shed, a concrete slab foundation is generally recommended for its durability and stability.

A. Site Selection and Preparation

Select a level site with good drainage. Clear the area of vegetation, debris, and any existing underground utilities. Mark the perimeter of the shed using stakes and string, ensuring accurate dimensions (12ft x 20ft). Consider the proximity to power sources and potential access points for material delivery.

B. Excavation and Compaction

Excavate the area to a depth appropriate for your chosen foundation type. For a concrete slab, a depth of approximately 6 inches is typically sufficient. The excavated area should be slightly larger than the shed's footprint to accommodate the formwork. Thoroughly compact the soil to provide a stable base for the concrete.

C. Formwork and Reinforcement

Construct formwork using pressure-treated lumber to contain the concrete. The formwork should be plumb and level, ensuring a flat and level slab. Install reinforcing mesh or rebar within the formwork to strengthen the concrete. This reinforcement is vital for resisting cracking and ensuring long-term structural integrity.

D. Concrete Pour and Curing

Pour the concrete into the formwork, ensuring it is evenly distributed and free of voids. Consolidate the concrete using a vibrator to remove air pockets. Allow the concrete to cure for at least 7 days before proceeding with construction, protecting it from excessive moisture loss and freezing temperatures.

II. Framing the Shed

The framing process establishes the structural integrity of the shed. Pressure-treated lumber is recommended for its resistance to rot and insect infestation. All lumber should be inspected for defects before use.

A. Floor Framing

Construct the floor joists using 2x6 or 2x8 lumber, spaced according to building codes (typically 16 inches on center). Ensure the joists are properly leveled and secured to the concrete slab using appropriate anchors. Lay down plywood subflooring, ensuring proper fastening and minimizing gaps.

B. Wall Framing

Construct the wall frames using 2x4 lumber, creating a sturdy framework. The wall framing should be plumb and square, ensuring the stability of the entire structure. Install wall sheathing (e.g., OSB) to the exterior of the frame, providing added strength and stability. Use appropriate fasteners to secure the sheathing.

C. Roof Framing

The roof framing will depend on the chosen roof style (e.g., gable, shed). Construct the rafters or trusses according to the selected design, ensuring they are properly secured to the wall frames. Install roof sheathing, ensuring proper fastening and weather tightness.

D. Loft Framing

The loft framing requires careful planning to ensure sufficient headroom and structural integrity. This often involves installing additional support beams or posts to the interior of the shed. The loft framing should be designed to support the anticipated weight of stored items. Consider using engineered wood products for increased load-bearing capacity.

III. Exterior Cladding and Roofing

The exterior cladding and roofing protect the shed from the elements. A range of materials are available, each with its own advantages and disadvantages.

A. Exterior Cladding

Select an appropriate exterior cladding material, such as vinyl siding, metal siding, or wood siding. Install the cladding according to the manufacturer's instructions, ensuring a weather-tight and aesthetically pleasing finish. Proper installation is crucial for preventing water damage.

B. Roofing

Choose a roofing material that meets your needs and budget. Options include asphalt shingles, metal roofing, or rubber roofing. Install the roofing according to the manufacturer's instructions, ensuring proper ventilation to prevent moisture buildup.

IV. Interior Finishing and Loft Access

Interior finishing adds functionality and aesthetic appeal to the workshop. The loft access should be carefully planned for safety and ease of use.

A. Interior Walls and Ceiling

Finish the interior walls and ceiling with drywall, plywood, or other suitable material. Ensure the surfaces are smooth and properly finished. Consider insulation to improve energy efficiency.

B. Loft Access

Install a safe and convenient method of accessing the loft. Options include a fixed staircase, a pull-down ladder, or a retractable staircase. Ensure compliance with building codes and safety regulations.

C. Electrical and Plumbing

This section requires the expertise of a licensed electrician and/or plumber. Install electrical wiring and outlets according to local codes and regulations. If plumbing is required, ensure compliance with all plumbing codes. Proper installation is essential for safety and functionality.

V. Final Inspections and Completion

Before utilizing the shed, ensure all aspects meet local building codes and regulations. A final inspection may be required by your local authority.

Disclaimer: This plan provides general guidelines. Specific requirements may vary based on location, building codes, and individual preferences. It is strongly recommended to consult with qualified professionals for specific advice and to ensure compliance with all applicable regulations.