Installing LP SmartSide is very doable for a careful DIYer, but the manufacturer’s instructions must always be followed exactly for warranty and moisture protection. The outline below gives a homeowner-friendly walkthrough you can use to understand the process before diving into the official guide.

What LP SmartSide Is

LP SmartSide is an engineered wood siding and trim system designed to look like traditional wood but resist rot, termites, and impact better than typical wood products. It comes in lap boards, vertical panel siding, shakes, soffit, and trim, all of which share similar fastening and flashing principles.

Prep: Walls, Weather Barrier, Layout

  • Make sure framing is plumb and straight; uneven walls can telegraph through the siding and require shimming at studs so you are not pulling boards tight over humps.
  • Install sheathing and a code‑approved weather‑resistive barrier (or a compatible sheathing system such as ZIP if allowed) with all seams taped and penetrations sealed before siding.
  • Plan your layout so starter courses are perfectly level and shiplap or lap joints land on studs; this makes the later courses faster and cleaner.

Fasteners and Nailing Basics

  • Use corrosion‑resistant fasteners: typically minimum 0.120 inch diameter, hot‑dip galvanized ring‑shank nails or equivalent, long enough to penetrate at least 1.5 inches into wood studs or 0.5 inch into furring.
  • For lap siding, nails are usually installed blind‑nailed along the top, about 3/4 inch from the top edge and 3/8 inch from board ends, with on‑center spacing commonly 8–10 inches, always hitting studs per the current LP guide.
  • Avoid over‑driving fasteners; heads should be snug to the surface, not breaking the face, and any mis‑driven nail holes must be sealed and re‑nailed correctly.

Installing Trim and Flashing First

  • Start with trim at corners, windows, doors, and along the base; corner and window trim is typically gapped off adjacent materials about 3/16 inch and fastened with multiple nails into studs at joints.
  • Install head flashing (drip cap/Z‑flashing) above windows, doors, and horizontal trim, leaving a small gap (often around 3/8 inch) between flashing edge and trim to allow drainage rather than filling it with sealant.
  • At the bottom of walls or where panel siding starts, install a base trim with Z‑flashing above, then maintain the required clearance above roofing, decks, soil, or paving as specified by LP.

Step‑by‑Step: Lap Siding

  1. Snap a level line and install a starter strip so the first course sits perfectly level and maintains proper clearance from the ground or roofing.
  1. Hang the first course of lap siding on the starter, ensuring the bottom edge is straight and maintaining the required overlap between courses, often at least 1 inch.
  1. Blind‑nail along the top of the board at the specified spacing into studs, keeping nails away from board ends and top edge per the manufacturer’s distances.
  1. Stagger butt joints between courses and make sure each joint lands on a stud, with approved flashing or joint treatment per LP details to shed water.
  1. Continue up the wall, checking courses for level, maintaining the same exposure, and trimming carefully at windows, corners, and gables.

Step‑by‑Step: Panel Siding

  1. After base trim and Z‑flashing are in place, position the first panel so it is level and the shiplap edges fall at the center of studs.
  1. Use the “double nailing” technique at shiplap vertical joints: nail through the shiplap on the first panel, then nail about 1 inch from the edge at the overlap flange of the second, both into the stud.
  1. Around panel edges, keep nails no more than about 6 inches apart, and at intermediate studs space them no more than about 12 inches, following the current LP schedule.
  1. Flash and gap every horizontal joint between panel courses with appropriate Z‑flashing and drainage gaps so water cannot sit in the joint.

Cuts, Sealing, and Finishing

  • When you cut LP SmartSide, always prime and paint exposed field cuts with a high‑quality 100% acrylic latex coating before installation to protect the substrate.
  • Do not caulk where flashing must drain, but do use sealant at designated joints and penetrations following LP’s current instructions for your product line.
  • After installation, complete painting or top‑coating within the time window LP specifies, using compatible exterior coatings to lock in long‑term durability.

Quick “Latest” Forum‑Style Notes

  • Recent homeowner and pro discussions highlight that getting the starter course level and keeping consistent nail depth are the two most common “learning curve” issues with LP SmartSide.
  • Many DIY builders in newer threads report success by watching LP’s own installation series videos alongside written instructions, then walking the house slowly to catch any missed nails, gaps, or unpainted cuts before calling it done.

Always cross‑check any step with the current LP SmartSide application instructions for your exact product, climate, and wall assembly so the installation stays code‑compliant and keeps the warranty intact.

TL;DR: Follow LP’s official application guide for fastener type and spacing, maintain clearances and flashing at all horizontal breaks and openings, treat every cut, and keep everything level and plumb as you work up the wall.

Information gathered from public forums or data available on the internet and portrayed here.