What cedar shakes look like from inside your attic
Cedar shakes are thick, hand-split wooden shingles that show a distinctive pattern when viewed from below. From your attic, you will see the underside of the shakes as irregular, chunky pieces of wood with a rough, splintered texture — nothing like the smooth, uniform appearance of asphalt shingles or the tight seams of metal roofing. The wood will have a warm tan or gray color depending on age and weathering, and the pieces will vary noticeably in thickness and width because they are split by hand rather than machine-cut.
The most reliable identifier is the spacing and irregularity. Cedar shakes do not lie flat and uniform like modern roofing materials. You will see gaps between pieces, uneven edges, and a layered, shingled pattern where each shake overlaps the one below it. If you run your hand along the underside (carefully, to avoid splinters), the surface will feel rough and organic rather than manufactured.
Look also for the fastening pattern. Cedar shakes are typically nailed with two nails per shake, and you may see the nail heads or holes from the attic side. The nails are usually galvanized steel or copper, which can show as dark spots or streaks on the wood.
Key Takeaways
- Cedar shakes viewed from the attic appear as thick, irregular wooden pieces with a rough, splintered texture and visible gaps between them, unlike the smooth uniformity of asphalt or metal roofing.
- The underside of cedar shakes will show a warm tan or gray color with hand-split edges that vary in thickness and width across the roof.
- Two nail holes per shake and a layered, overlapping pattern are physical markers that distinguish cedar from other roofing materials when inspected from below.
- Age and weathering will darken cedar shakes over time, so older roofs may appear grayer or more weathered than newer installations.
- Moisture stains, mold, or soft spots in the wood indicate cedar shake deterioration and mean the roof may need attention soon.
How age and weathering change what you see
New cedar shakes are light tan or honey-colored, but this changes as the roof ages. Within a few years, exposure to sun and moisture turns the wood gray or dark brown. From the attic, an older cedar roof will look darker and more uniform in color than a newer one, though the irregular shape and spacing will remain the same.
Weathering also creates visible damage patterns. Look for soft or spongy wood, which indicates rot. Check for dark stains or streaks running down the underside of the shakes — these are often mold or algae growth that follows water paths. Cedar that has been wet for extended periods may show black discoloration or a fuzzy appearance. These are signs the roof is failing and water is getting through.
Checking for rot and water damage from below
The attic is the best place to spot water problems before they become expensive. Press gently on the underside of the shakes with your finger or a screwdriver handle. If the wood feels soft, spongy, or if your finger leaves an impression, the shake is rotting and losing structural integrity. Cedar is durable but not immune to decay, especially in damp climates or where ventilation is poor.
Look at the wood grain and surface. Healthy cedar will have a firm, tight grain. Rotted cedar will look stringy, crumbly, or like it is separating into fibers. You may also see insect damage — small holes or tunnels in the wood indicate carpenter ants or wood-boring beetles, which are common in cedar roofs and accelerate decay.
Check the nails and fasteners. If nails are rusted heavily or if you see rust stains spreading from the nail holes, moisture is reaching the fasteners and will eventually weaken the connection between shake and roof deck. This is a sign the roof's waterproofing is compromised.
Distinguishing cedar from composite or architectural shingles
Composite shingles designed to look like wood are made from fiberglass, asphalt, and mineral granules. From the attic, they look uniform and manufactured — the edges are clean and straight, the thickness is consistent, and the surface is smooth rather than rough. Composite shingles also feel lighter and more brittle than cedar.
Architectural shingles (also called dimensional shingles) are thicker asphalt shingles with a layered appearance meant to mimic wood. However, they still have a smooth, granulated surface and uniform edges. Cedar shakes have a splintered, hand-split texture that no manufactured product fully replicates. If you can see the grain of the wood clearly and feel the roughness, it is cedar.
The weight is another clue. Cedar shakes are heavy — a square (100 square feet) weighs 300 to 400 pounds. If your roof framing shows signs of significant structural reinforcement or if the roof deck feels unusually solid and thick, cedar is more likely than lighter asphalt alternatives.
What to look for in the attic space itself
The condition of the attic around the roof tells you about the roof's performance. If you see water stains on the rafters, roof deck, or insulation, the cedar shakes are leaking. Look for stains that follow the grain of the wood or run down the underside of the roof deck — these trace the path water takes as it enters.
Check for mold or mildew on the underside of the roof deck or on the rafters. This grows when moisture is trapped in the attic, which happens when the roof is not ventilating properly or when shakes are failing. Proper ventilation should allow air to flow from the soffit vents to the ridge vent, keeping the attic dry.
Look at the insulation. If it is wet, compressed, or discolored, water is getting in. Wet insulation loses its R-value and can lead to rot in the framing. This is a sign the cedar roof needs inspection or repair soon.
When to call a professional roofer
If you find soft wood, active rot, significant water stains, or mold in the attic, contact a roofer who has experience with cedar shake roofs. Cedar requires specialized knowledge — it is not the same as repairing asphalt shingles, and mistakes can be expensive.
A professional can assess whether the roof needs spot repairs, a full replacement, or just maintenance like cleaning and sealing. They can also check the roof deck and framing for hidden damage that you cannot see from the attic. Cedar roofs can last 40 to 60 years with proper care, but once decay starts, it spreads quickly.
If you are not comfortable in the attic or if the roof is steep or high, do not attempt a detailed inspection yourself. A roofer can get on the roof and inspect both the underside and the exposed surface, giving you a complete picture of the roof's condition.
Frequently Asked Questions
Can I tell if shakes are cedar or another type of wood from the attic?
Cedar has a distinctive warm tan or gray color and a rough, splintered texture. Other wood shakes (like redwood or pressure-treated lumber) look similar but are less common on residential roofs. If the shakes are thick, hand-split, and show the grain clearly, cedar is the most likely material. A roofer can confirm the species if you are unsure.
What does cedar shake rot look like from below?
Rotted cedar appears soft, spongy, or crumbly when pressed. The wood may look stringy or separated into fibers, and the color is often darker or black. You may also see mold or a fuzzy coating. If your finger or a screwdriver leaves an impression in the wood, the shake is rotting and needs attention.
Is it normal to see gaps between cedar shakes from the attic?
Yes. Cedar shakes are hand-split and irregular, so gaps between pieces are normal. However, very large gaps or gaps that are widening suggest the shakes are shrinking or the roof is settling. If gaps are new or growing, have a roofer inspect the roof.
How often should I inspect my cedar shake roof from the attic?
Once a year is reasonable, ideally in fall after summer heat and before winter moisture. If you live in a damp climate or if your roof is older than 30 years, inspect twice a year. After heavy storms or if you notice water stains, inspect right away.
What should I do if I find water stains but no visible damage to the shakes?
Water stains mean water is getting in somewhere. The leak may be coming from a different part of the roof and traveling along the framing before dripping in the attic. Have a roofer inspect the entire roof, not just the area under the stain. Leaks are easier and cheaper to fix early.