Choosing the Best Wood for Sash Windows
Did you know that a wide range of timbers can be used to make sash and case windows? At Eco Sash and Case, we offer several different timber choices for your windows. Every option has benefits of its own, affecting not only how your windows look but also how long they last and how much maintenance they require.
With this guide we will help you compare the different types timber that can be used to manufacture your sash windows. Including softwoods, hardwoods, and modern modified woods. Allowing you to make the right choice for your home.
Why Timber Choice Matters
The timber you select for your windows will influence how long they last, how much maintenance they’ll need, and how well they withstand the elements. You should think about the following when selecting the ideal wood for your sash windows:
Durability – Can the wood withstand moisture, insects, and rot?
Maintenance – How frequently will the timber require painting or other treatments?
Sustainability – Is the timber responsibly sourced and eco-friendly?
The Difference Between Hardwood and Softwood
Understanding the differences between hardwood and softwood is important when it comes to choosing which timber is right for you.
Hardwoods like oak, sapele, or meranti are dense, strong, and naturally resistant to wear. In particular, European Oak has been used in construction for centuries due to its complex structure.
Why choose hardwood?
- Long lifespan (50+ years with proper care)
- Strong, heavy, and highly resistant to decay
- Traditional used in heritage homes
One downside to hardwood is the higher cost which makes hardwood windows a more sizeable investment.
Softwoods, such as redwood or Scots pine, are the most common choices for sash windows. They’re affordability and versatility makes them a great all-rounder timber.
Why choose softwood?
- Budget-friendly choice
- Paint and finishes adhere beautifully
- Can still last for decades with the property maintenance
One of the downside to softwoods is they have a less dense structure and require regular upkeep (repainting every few years).
When deciding between softwood or hardwood, consider the specific properties of softwood and hardwood that align with your needs.
Engineered Timber: The Modern Alternative
We also offer engineered timber like Accoya which are an excellent option. This modified wood undergoes an acetylation process to enhance its properties. Accoya’s chemical treatment process results in exceptional dimensional stability and weather resistance.
Why is Accoya popular:
- Extremely stable, won’t warp, swell, shrink or rot.
- Long lifespan (up to 50 years)
- Eco-friendly, made from sustainably grown softwoods
- Low maintenance compared to natural timbers
Best Timber Options for Sash Windows
1. Redwood (Softwood)
Redwood is a traditional, affordable, and lightweight timber, making it a popular choice for sash and case windows. It is cost-effective, easy to work with, and widely available, which adds to its practicality for many homeowners. However, redwood has a lower natural resistance to rot and therefore requires regular maintenance to ensure its longevity. This makes it best suited for budget-conscious homeowners or for windows located in less exposed areas where the timber is better protected from the elements.
2. Sapele (Hardwood)
Sapele, a West African hardwood, is prized for its rich reddish-brown color and fine interlocking grain. Providing a excellent balance between strength, stability, and affordability, making it a popular alternative to oak. Dense and durable, sapele is highly resistant to rot and weathering while offering an attractive natural appearance with a mahogany-like finish. However, availability and cost can vary due to reliance on imports.
3. Accoya (Modified Softwood)
Accoya, a modified softwood, known for its unbeatable performance. It offers outstanding durability, exceptional resistance to rot and swelling, and remarkable stability in all climates. In addition to its performance benefits, Accoya is also eco-friendly and low maintenance, aligning with sustainable building practices. While Accoya comes with a higher initial cost compared to untreated softwood, its long-term advantages make it a worthwhile investment.
Which Timber Is Best?
- For affordability: Treated softwood like redwood offers great value but needs regular
- Timeless Hardwood Charm: Sapele or meranti provide strength, authenticity, and timeless character.
- For modern performance: Accoya stands out for its stability, eco credentials, and minimal maintenance issues.
Maintaining Timber Sash Windows
To keep your sash windows looking beautiful and performing well:
- Inspect annually for cracks, peeling paint, or signs of water damage
- Clean with a damp cloth to remove dirt and dust
- Repaint or restain every 3–5 years to protect against moisture
Proper sash and case maintenance is key to avoiding major maintenance issues down the line.
How Long Do Wooden Windows Last?
One of the biggest advantages of timber sash windows is their longevity:
- Softwood: 40+ years with proper care
- Hardwood: 50+ years, often lasting a lifetime but proper care is still required
- Engineered timber (Accoya): 50 years or more with minimal maintenance, often coming with an anti-rot guarantee.
