Building on rural hillside and valley properties presents a specific set of construction challenges that differ significantly from flat-lot suburban development. Steep terrain requires specialized foundation systems, complex roof geometries, and careful material selection for exterior cladding. The scale of the property – whether 5 acres or 1,745 acres – determines the scope of site work, but the core construction principles remain the same. Understanding valley roof framing and construction techniques is essential because hillside homes almost always require hip and valley roof assemblies to shed water efficiently across irregular building footprints. A 7,300-square-foot hillside home on 1,745 acres, for example, may have roof lines that intersect at six or more valley points, each requiring precise flashing and drainage detailing.
Redwood Siding Selection for Rural Exposure
Redwood siding is a preferred cladding material for rural hillside homes because of its natural resistance to decay, insect damage, and dimensional stability in high-moisture environments. Heartwood-grade redwood contains extractives that act as natural preservatives, giving it a service life of 30 to 50 years without pressure treatment. For hillside properties exposed to fog, rain, and temperature swings, this durability makes redwood a practical choice that outperforms cedar and standard pine in side-by-side comparisons.
Redwood Grades and Applications
Redwood is graded into three primary categories that determine its appropriate use on a building exterior.
- Clear All Heart: The highest grade, free of knots and sapwood. Recommended for siding and trim where appearance matters most. Contains the highest concentration of natural extractives for maximum decay resistance. Costs 2–3 times more than construction heart grade.
- Construction Heart: Contains small tight knots but is 100 percent heartwood. The standard choice for exterior siding on hillside homes. Offers excellent decay resistance at a lower price point than clear grades.
- Construction Common: Contains both heartwood and sapwood with larger knots. Suitable for utility structures, decks, and less visible applications but not recommended for primary siding in wet climates.
Once redwood siding is installed, exposure to weather gradually turns the surface a silvery gray. For property owners who prefer the original warm red-brown color, cleaning and staining weathered redwood siding becomes a recurring maintenance task. The process involves removing the gray oxidized surface layer with an oxygen-based bleach cleaner, rinsing thoroughly, and applying a semi-transparent stain formulated for redwood. A single staining cycle lasts 3 to 5 years depending on sun exposure and rainfall intensity.
Valley Roof Geometry and Water Drainage
Valley roof assemblies – where two roof planes intersect at an interior angle – are the most water-vulnerable points on any hillside home. A poorly detailed valley forces water, snow, and debris into the intersection where it can back up under shingles and saturate the roof deck. Proper valley geometry begins with selecting the right construction method for the climate and roof pitch. The Cali Valley technique documented by Fine Homebuilding has gained traction outside the West Coast because its continuous metal flashing profile eliminates the step-flashing gaps that cause leaks in conventional valley construction.
Open Valley vs. Closed Valley Construction
Two methods dominate valley roof construction, and the choice affects both performance and installation time.
Open Valley (Metal Flashing)
An open valley uses a continuous strip of metal flashing – typically 24-inch-wide G-90 galvanized steel or 20-ounce copper – centered along the valley intersection. Shingles are cut back 4 to 6 inches from the valley centerline on each side, exposing the metal. This method provides the best water-shedding performance because debris and water flow directly onto the metal surface rather than under shingle edges. Open valleys are standard in regions with heavy rainfall or snow loads, but the exposed metal can be visually prominent.
Closed Valley (Weave Method)
A closed or woven valley interlaces shingles from one roof plane over the other, creating a continuous shingle surface without exposed metal. This method produces a cleaner visual appearance but performs worse in heavy rain because water can capillary-wick between the woven layers. Closed valleys are best suited for low-pitch roofs (below 4:12) in moderate climates where snow accumulation is not a concern.
| Valley Type | Water Capacity | Visual Impact | Best Climate | Installation Complexity |
|---|---|---|---|---|
| Open metal flashing | High | Visible metal | Heavy rain, snow | Moderate |
| Closed woven | Moderate | Continuous shingle | Moderate, low-pitch | Low |
| Cali Valley | Very high | Low-profile metal | All climates | High (specialty) |
| Closed cut | Low–moderate | Clean line | Mild, arid | Low |
Maintaining Redwood Siding Through Seasonal Exposure
Redwood siding on a hillside property faces accelerated weathering from direct sun, wind-driven rain, and temperature cycling. A maintenance schedule that matches the exposure intensity keeps the siding performing for decades without replacement.
Cleaning and Restoration Protocol
Over time, redwood siding develops a weathered gray patina as UV light breaks down lignin in the wood surface. The gray layer is about 1/32 inch deep and must be removed before any stain or sealer will bond. Pressure washers set below 1,200 psi – combined with a wood-cleaning solution – strip the oxidized layer without damaging the wood fibers. An oxygen bleach solution (sodium percarbonate mixed with water) cleans effectively without the environmental drawbacks of chlorine bleach, which can harm nearby plantings on rural properties.
The complete process for cleaning and staining weathered redwood siding involves four steps: wet the siding surface, apply cleaning solution from bottom to top, let it dwell for 10 to 15 minutes without drying, and rinse thoroughly at low pressure. After 48 to 72 hours of drying time – weather-dependent – apply two coats of semi-transparent stain with a brush or sprayer, back-brushing to ensure even penetration. South and west-facing elevations need refinishing more frequently, typically every 3 years, while north-facing siding may go 5 years between coats.
Framing Unequally Pitched Valley Roofs
Hillside homes often require valley roofs where the intersecting planes have unequal pitches – for example, a 6:12 main roof meeting a 10:12 addition roof. This asymmetric geometry changes the valley line from a 45-degree diagonal to a compound angle that requires careful rafter layout.
The key difference in unequal-pitch valleys is that the valley jack rafters on each side have different lengths and different bevel angles. On the steeper pitch side, the valley jack rafters are shorter and meet the valley board at a sharper angle. Framers must cut both the side bevel and the plumb cut on each jack rafter, with the bevel angle calculated from the ratio of the two pitches. Valley framing for unequally pitched roofs typically uses a framing square with the two pitch numbers aligned on the tongue and blade to scribe the compound miter.
| Pitch Ratio (Main:Secondary) | Valley Line Angle | Jack Rafter Bevel (Steep Side) | Jack Rafter Bevel (Shallow Side) |
|---|---|---|---|
| 6:12 / 8:12 | 39.8° | 32.5° | 24.8° |
| 8:12 / 12:12 | 35.3° | 37.2° | 19.6° |
| 4:12 / 8:12 | 42.5° | 28.9° | 28.9° |
| 6:12 / 12:12 | 37.8° | 35.8° | 22.4° |
Roof Truss Installation on Complex Hip and Valley Roofs
For hillside homes with complex roof geometries, factory-built trusses reduce on-site labor and material waste compared to stick-framing. Truss manufacturers use computer modeling to generate layout drawings that show the exact position, bearing point, and connection detail for every truss in the assembly. A typical hip-and-valley roof on a 7,300-square-foot home requires 60 to 120 individual trusses depending on roof complexity and the number of intersecting ridges.
Sequencing the Truss Installation
The installation sequence for complex roof trusses follows a specific order. Installing roof trusses on complex hip and valley roofs requires starting with the common trusses on each side of the valley, then placing the valley trusses at the intersection, and filling in the jack trusses last. This sequence ensures that the valley trusses – which carry the heaviest loads at the intersection – are fully supported by the common trusses framing into them. Temporary lateral bracing must be installed as each truss section is placed, with at least 50 percent of the braces remaining in place until the roof sheathing is fully fastened.
Hip trusses – which run diagonally from the ridge to the exterior wall corner – require special hanger connections at their bearing points because they transfer loads at an angle to the supporting walls. Each hip truss connection must be engineered for the specific load, and the hangers should be rated for the full design load with no reduction factor. On rural hillside sites where crane access is limited, modular truss sections that can be assembled on the ground and lifted into place reduce the need for large equipment. Double-beveled rafters are a specialized technique that addresses the unique compound angles where hip and valley intersections create load conditions that standard truss hardware cannot handle – the rafter is beveled on both the top and bottom edges to sit flush against the valley board while maintaining full bearing on the supporting structure.