Replacing the siding on your home is one of the most impactful exterior upgrades a homeowner can tackle. New siding transforms the look of a property, improves energy efficiency, and protects the structure from weather damage. While professional installation can cost thousands, taking on the work yourself can save roughly half that expense. However, be realistic about what the job entails. Siding a house requires heavy labor, careful planning, and competence with tools. You must be willing to follow instructions closely and adapt them to your home’s unique features. Before starting, read up on the fundamentals of installing vinyl siding correctly to understand the full scope of the project. For large or tall homes, especially those on sloped lots, hiring a professional contractor remains the safer choice. This article covers the key stages of a siding replacement project, from material selection through final installation, helping you achieve long-lasting results.
Why Replacing Siding Is a Smart Investment
Existing siding can deteriorate over time due to sun exposure, moisture infiltration, and physical impact. Cracks, warping, rot, and fading are clear signs that replacement is needed. Beyond aesthetics, damaged siding allows water to reach the sheathing and framing, leading to mold growth and structural decay. Replacing worn siding stops this damage in its tracks and provides an opportunity to upgrade insulation and air sealing. There are plenty of solid reasons to take on this project, which is why many homeowners find replacing your siding is a great idea for both property value and comfort. New siding also eliminates the need for frequent painting or staining, reducing ongoing maintenance demands significantly.
Common Siding Materials Compared
Each siding material offers distinct advantages and trade-offs. Vinyl siding remains the most popular choice due to its low cost and minimal maintenance requirements. Fiber cement offers superior durability and fire resistance but demands more careful handling during installation. Wood siding provides timeless appeal but requires regular painting or staining. Engineered wood products bridge the gap between natural wood and synthetic materials with better moisture resistance than traditional lumber. Aluminum siding, while less common today, still sees use in some regions for its lightweight properties and recyclability.
| Material | Cost per Sq Ft | Durability | Maintenance | Typical Lifespan |
|---|---|---|---|---|
| Vinyl | $3 – $7 | Good | Low | 20 – 40 years |
| Fiber Cement | $6 – $12 | Excellent | Low | 50+ years |
| Wood (Cedar) | $5 – $10 | Moderate | High | 20 – 30 years |
| Engineered Wood | $4 – $9 | Good | Moderate | 25 – 40 years |
| Aluminum | $4 – $8 | Moderate | Low | 25 – 35 years |
Estimating Your Siding Requirements Accurately
Getting an accurate material estimate is critical to avoid costly shortages or wasteful overages. The calculation process is straightforward but requires careful measurement. Start by measuring each exterior wall from corner to corner for width and from foundation to eaves for height. Multiply length by height for each wall to get individual square footage totals. Add all wall totals together to obtain the gross surface area. Then measure all windows, doors, and other areas that will not receive siding and subtract that total from your gross area. This net figure represents your approximate coverage requirement. For more detailed guidance on getting these numbers right, review the steps for exterior siding installation for long lasting results before committing to a material order.
Adjusting for Waste and Overlap
Raw square footage is only the starting point. You must add a waste factor to account for cutting losses, damaged pieces, and siding overlap. The standard waste allowance is 10 percent for straightforward rectangular homes with simple roof lines. If your house has a steeply pitched roof, multiple gables, dormers, or complex angles that require extensive cutting, increase this to 15 percent. Some siding profiles, such as Dutch lap or board-and-batten, require additional material for the overlap between courses. Always consult the manufacturer’s installation guide for their specific waste and overlap recommendations. Most manufacturers provide detailed charts that factor in the siding pattern you choose.
Understanding Siding Units of Sale
Siding materials are sold using different units depending on the product type:
- Vinyl and aluminum siding are sold by the square foot for panels, with trim pieces priced per linear foot.
- Fiber cement boards are commonly sold per square, where one square equals 100 square feet of coverage.
- Plywood and hardboard panels are also sold by the square, typically in 4 by 8 or 4 by 9 foot sheets.
- Wood shingles and shakes are sold by the bundle, with coverage varying by exposure width.
- Trim accessories such as corner posts, J-channel, and starter strips are all priced per linear foot and should be estimated separately from the main siding body.
Knowing these conventions helps you translate your square footage estimate into an accurate order quantity. Always order slightly more than your calculated need to allow for last-minute adjustments and future repairs.
Preparing Walls for New Siding
Proper wall preparation determines the success and longevity of any siding installation. If your existing wall surface is flat, sound, and made of a compatible material, you may be able to nail new siding directly over it. This approach saves time and disposal costs. However, when the existing siding is metal, vinyl, masonry, or has an irregular surface, you must either strip it completely or install furring strips to create a level nailing base. Learning about solo clapboard siding installation using homemade hangers can be particularly helpful when working alone on the stripping and preparation phase.
Removing Old Siding Effectively
Stripping old siding requires the right tools and a methodical approach. Essential tools include a claw hammer, a flat prybar, a cat’s paw nail puller, and a pair of locking pliers for stubborn nails. The removal sequence matters: always start at the top of the wall and work downward. This prevents debris from falling behind siding that is still attached and reduces the risk of damaging the building paper underneath. For wood siding, use the cat’s paw on the first board to get underneath the nails, then switch to the flat prybar for subsequent boards. This technique minimizes marring and splitting of the wood. For shingles or shakes, a square-bottom shovel inserted beneath them provides excellent leverage for lifting and prying them off.
Handling Difficult Siding Types
Some siding materials require specialized removal techniques:
- Stucco removal is extremely labor-intensive and creates large amounts of heavy debris. If possible, apply new siding directly over the existing stucco surface to avoid this headache.
- Asbestos shingles must not be broken or sanded. Consult a licensed abatement professional for safe removal and disposal.
- Metal siding often has hidden fasteners and interlocking edges. Work a prybar carefully behind each panel to disengage the locking mechanism before prying.
- Vinyl siding removal is straightforward once you understand the locking system. Use a zip tool to release the panel from the course below, then slide it downward and out.
Furring Strips for Irregular Surfaces
When you cannot strip the old siding or when the wall surface is uneven, furring strips provide an effective solution. These are typically 1 by 2 or 1 by 3 inch lumber strips nailed vertically to the wall at 16 or 24 inch intervals. The furring strips create a gridwork that provides a flat, level nailing surface for the new siding. Use a long level or laser level to ensure the strips are plumb and coplanar. Shims behind the strips can correct for deep low spots in the wall. This method works well over brick, stucco, or highly uneven wood siding where direct attachment would be problematic.
Siding Installation Methods and Best Practices
Once the wall is prepared and the material is selected, the actual installation begins. Each siding material has its own fastening rules, overlap requirements, and trim details. Following the manufacturer’s instructions precisely is not optional; it directly affects warranty coverage and long-term performance. When choosing between popular modern materials, understanding the key differences matters. A comparison of LP SmartSide siding vs. fiber cement siding reveals important considerations for weight, cutting methods, and fastener requirements that influence installation speed and tool choices.
Fastening Guidelines for Different Materials
Correct fastening is essential for siding performance. Nails must be long enough to penetrate at least 1.5 inches into solid wood sheathing or studs. For vinyl siding, drive nails snug but not tight to allow for thermal expansion and contraction; the nail head should be flush with the siding surface but not sunk into it. Fiber cement requires corrosion-resistant nails and pre-drilling for nail heads to prevent cracking. Wood siding accepts both nails and screws, with stainless steel or hot-dipped galvanized fasteners preferred to prevent rust staining. Always leave a small gap at butt joints and corners to accommodate material movement with temperature changes.
Weather Barriers and Flashing
Before installing any siding, ensure that a proper weather-resistant barrier is in place. House wrap or building paper should overlap shingle-fashion, with upper courses lapping over lower ones to shed water. All windows, doors, and other wall penetrations must be flashed correctly using metal or self-adhered membrane flashing. Pay special attention to the following areas:
- Window and door openings require head flashing that directs water outward over the siding.
- Bottom-of-wall junctions need drip edges or starter strips to prevent capillary water draw.
- Inside and outside corners demand specific trim pieces or flashing details depending on the siding material.
- Penetrations for pipes, vents, and electrical boxes should be sealed with compatible caulk and fitted with flashing pans where possible.
Working Around Obstacles and Details
A professional-looking siding installation depends heavily on how well you handle the challenging details. Gable ends require angled cuts that must be measured precisely for each piece. Soffits must be installed before the final course of siding reaches the eaves to maintain a clean transition. Electrical fixtures, hose bibs, and exterior lights need careful trim work around their bases. Schedule the work to complete one full wall at a time rather than jumping between areas, as this helps maintain consistent alignment and reduces the risk of cumulative measurement errors.
Replacing your home’s siding is a substantial undertaking that rewards careful planning, accurate estimating, and methodical execution. From the initial measurement and material selection through wall preparation and final fastening, every step builds on the previous one. Mistakes in the estimating phase can lead to material shortages or excessive waste, while poor wall preparation can compromise the entire installation regardless of how well the siding itself is installed. Taking the time to properly assess your existing wall condition and choose the right material for your climate and budget pays dividends in the long run. Whether you are stripping old cedar shingles or upgrading to modern fiber cement, the principles remain the same. For homeowners considering a full exterior refresh, replacing cedar shingles with modern siding and trim materials offers a practical path to improved durability and reduced maintenance. With careful preparation and attention to detail, a DIY siding replacement can deliver professional-grade results that protect and beautify your home for decades.