01Waterproofing
Elevated Waterproof Deck Restoration
Portland, OR
- •Westcoat ALX waterproofing membrane
- •TREMCO Vulkem traffic-grade topcoat
- •Pressure-treated framing reinforcement
Serving Portland & Willamette Valley with 10+ years exp.
Oregon's owner-led
waterproofing specialists.
Over 10 years of hands-on deck waterproofing, remodeling, and construction. No subcontractors — owner Miguel Altamirano is on every project.
Featured
Modern PNW deck at golden hour
Our services
Specialty waterproofing and deck services.
From full waterproofing systems to commercial projects, our owner-led crew handles every job start to finish.
01Waterproofing
Waterproof Deck Patios
Specialty waterproofing systems for elevated and concrete decks using Westcoat and TREMCO membranes.
Learn more about Waterproof Deck Patios
02Remodeling
Deck Remodeling
Transform an aging deck into a beautiful, durable outdoor living space built for Oregon weather.
Learn more about Deck Remodeling
03Siding
Siding
Durable siding installation and replacement that complements your home and protects against PNW weather.
Learn more about Siding
04New Build
New Deck & Patio
Custom-designed new decks and patios engineered for your site, use, and budget.
Learn more about New Deck & Patio
05Retrofit
Retrofit Existing Decks and Patios
Breathe new life into an existing deck with structural upgrades, new finishes, or a waterproofing retrofit.
Learn more about Retrofit Existing Decks and Patios
06Commercial
Commercial Deck & Patio
Commercial-grade waterproofing and construction for small commercial properties, local businesses, multi-family, retail, and hospitality spaces.
Learn more about Commercial Deck & PatioWhy Alta
Two reasons we’re different.
Owner on every project
Owner Miguel Altamirano is on every job from start to finish. No subcontractors, no surprises — just one accountable expert accountable to you.
Meet our team →Waterproofing specialists
Most contractors dabble in waterproofing. We specialize in it. Our crews are certified by Westcoat and TREMCO, with systems built for Oregon’s climate.
Learn about our waterproofing →Our process
Simple. Transparent. Owner-led.
01
Free Consultation
We meet on-site to understand your goals, inspect the space, and answer questions.
02
Detailed Estimate
You receive a written, line-item estimate with materials, labor, and timeline.
03
Owner-Led Work
Miguel and our crew execute the work — no subcontractors, daily updates.
04
Final Walkthrough
We walk the project with you, address punch list items, and hand over warranties.
04
See how we transform real homes.
Drag the slider to compare before and after. Every project is owner-led, manufacturer-certified, and built for Oregon weather.
01 — Elevated Waterproof Deck Restoration
Before
After
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02 — Cedar Deck & Cable Railing Replacement
Before
After
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03 — Concrete Patio Waterproofing
Before
After
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04 — Fiber Cement Siding Replacement
Before
After
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From our clients
2,000+ projects completed.
Average rating across all projects
“Miguel walked us through every step and was on-site every single day. Our waterproofed deck has handled two PNW winters with zero issues. Worth every penny.”
“Three bids, three very different scopes. Alta's was the most thorough and the only one that explained the Westcoat system. Three years later, still perfect.”
“Owner-led really means something here. No subcontractors showed up — same crew start to finish. The retrofit saved us thousands vs a full rebuild.”
Our work
Recent projects.
Swipe to explore. Each project includes materials used and the work completed.
02Retrofit
Cedar Deck & Cable Railing Replacement
Beaverton, OR
- •Premium cedar deck boards
- •Stainless steel cable railing system
- •Hot-dipped galvanized post anchors
03Waterproofing
Concrete Patio Waterproofing
Lake Oswego, OR
- •Concrete crack repair mortar
- •Westcoat ALX base coat
- •Decorative quartz aggregate broadcast
04Siding
Fiber Cement Siding Replacement
West Linn, OR
- •James Hardie fiber cement lap siding
- •Tyvek HomeWrap weather barrier
- •HardieTrim fiber cement boards
05New Build
New Deck Construction
Gladstone, OR
- •Pressure-treated 2x10 joists
- •Simpson Strong-Tie connectors
- •Galvanized post bases
06Commercial
Multi-Family Waterproofing
Hillsboro, OR
- •TREMCO traffic-bearing membrane
- •Pedestal paver system (subsurface)
- •Metal edge termination profiles
07Siding
Craftsman Cedar Siding Restoration
Sherwood, OR
- •Clear-grade cedar lap siding
- •Stainless steel ring-shank nails
- •Benjamin Moore Arborcoat stain
08Retrofit
Deck Retrofit & Waterproofing
Wilsonville, OR
- •Joist reinforcement brackets
- •Westcoat ALX retrofit system
- •New flashing at wall transitions
09Waterproofing
Hillside Home Waterproofing
Fairview, OR
- •Engineered drainage mat
- •Westcoat ALX full system
- •Custom metal edge terminations
Where we work
Serving 24 cities.
Hover the map or pick your city from the list. Owner-led service across Portland Metro and the Willamette Valley.
Portland Metro(21)
Willamette Valley(3)
Certifications
Certified by industry leaders.
Westcoat
Certified Installer
TREMCO
Certified Installer
ICC-ES
Code-Rated Systems
CCB
Licensed & Insured