Building reliable and safe anchors on loose sandstone terrain presents unique challenges for climbers. Sandstone, while often beautiful and offering excellent climbing opportunities, is notorious for its unpredictable holds and friable texture. This makes anchor-building on multi-pitch routes particularly tricky. In this blog, we will explore the best practices for building solid, secure anchors on loose sandstone terrain, focusing on strategies that minimize the risk of failure and maximize safety.
Understand the Terrain: Evaluate the Rock Quality
Before building any anchor, it's essential to understand the characteristics of the sandstone in the area. Loose sandstone often has large holds that can be easily pulled off, creating a serious risk of failure. Evaluating the rock quality helps you decide where to place anchors and what type of gear to use.
Key Strategies:
- Look for Solid Features : Focus on more compact areas of the rock, avoiding loose or flaking parts. Look for cracks, ledges, or solid knobs that seem firmly embedded.
- Avoid Areas with Large Loose Blocks : If a rock feature moves easily when you apply pressure, it's best to avoid using it for anchor points.
- Consider the Whole Anchor System : When assessing the rock, remember that the anchor's security depends on all components (placement, gear, and connections). Don't rely on a single, questionable feature.
Use Natural Features Carefully
In loose sandstone, it's often tempting to rely on natural features like horns, cracks, and ledges for your anchor points. While these can work well when properly utilized, they require extra care and attention.
Key Strategies:
- Crack Anchors : When placing an anchor in a crack, make sure it's deep and solid enough to accommodate multiple pieces of protection. Avoid cracks that are wide enough to be unstable or shallow.
- Horn Anchors : Horns can be great anchor points, but ensure they are solid and have enough mass. They should be checked by applying force in different directions to make sure they are firmly connected to the rest of the rock.
- Ledges and Slabs : Ledges can be useful for placing gear, but often they can be made of friable or weathered rock. Place your gear in the most solid part of the ledge, and consider back-up options to spread the load.
Use Camming Devices for Better Protection
Cams are ideal for loose sandstone because they provide excellent placement in irregular cracks. They expand to fill the shape of the crack, making them an effective choice when the rock is loose or friable. However, their effectiveness depends on choosing the right size and orientation.
Key Strategies:
- Double Cam Placements : When building a multi-pitch anchor on loose sandstone, using double cam placements in parallel cracks or wider fissures can ensure redundancy. This minimizes the risk of both cams failing simultaneously.
- Active vs Passive Protection : For loose rock, try to use more active protection (like cams) compared to passive gear (like nuts), as they are less likely to be dislodged by shifting rock or dynamic forces.
- Test Placements: After placing your cam, give it a good pull to ensure it is firmly set and can withstand the forces it will be subjected to during climbing.
Multi-Point Anchors: Building Redundant Systems
On loose sandstone, redundancy is key. Always aim to build anchors with multiple points of contact to the rock, distributing the load evenly to prevent failure. In some cases, one bad placement can cause the entire system to fail.
Key Strategies:
- Equalize the Load : Use cordelette or webbing to tie together the different anchor points. This equalizes the load and distributes forces across the entire system. Be sure to double-check that the cordelette or webbing is tied securely and that all knots are appropriately dressed.
- Consider Directionality : Make sure your anchor points are placed so that forces are directed into solid parts of the rock. If possible, position the anchor points in a way that minimizes the risk of one point becoming overloaded.
- Back-up Points : Always include a back-up point, especially when building your anchor in areas where you cannot fully trust a single feature.
Use Modern Protection Gear for Maximum Safety
While traditional gear such as nuts and hexes can work in sandstone, modern protection gear offers several advantages, particularly when working with loose or variable rock quality.
Key Strategies:
- Anchoring with Slings and Quickdraws : When you find a solid feature like a large boulder or a solid horn, using slings and quickdraws can provide a quick and effective anchor. These can be especially useful for creating a versatile, multi-pitch anchor setup that can be adjusted easily.
- Using Bolts as Backup : In areas where natural protection is unreliable, consider placing additional bolts (if available). These provide an added layer of security but should only be used when absolutely necessary, especially if the rock around them is known to be unstable.
- Passive Protection : If you are using nuts or other passive protection, ensure that you place them in deeper, more secure parts of cracks. Try to avoid shallow placements, as these are more likely to slip or come loose on loose sandstone.
Check for Rock Movement and Test Your Anchor
Once your anchor is set, it is critical to test it. In loose sandstone, even small movements can indicate that a hold may come loose, so make sure the system is solid before committing to it.
Key Strategies:
- Test Each Anchor Point : Apply steady pressure to each individual point of your anchor. If any point feels loose or unstable, replace it with a more secure placement.
- Simulate Forces : If possible, apply different types of force to the anchor (sideways, vertical) to see how it reacts. Loose sandstone can respond unpredictably, so it's important to simulate the types of stresses the anchor will face during the climb.
- Team Checks : Always have a second pair of eyes to check your anchor system. They might notice something you missed, such as an unstable rock feature or an improperly secured knot.
Consider the Use of a Backup Belay Device
When climbing on loose sandstone, especially on multi-pitch routes, it's wise to use a backup belay device in addition to your primary anchor system. This adds another layer of security and ensures that, should anything go wrong with the primary system, the belay will still function.
Key Strategies:
- Add a Second Belay : If possible, set up a second belay device with a dedicated rope, so that in case of anchor failure, the second belay provides immediate backup.
- Use a Reversible Belay Device : Consider a reversible or frictionless belay device that can be easily adjusted and switched during transitions, providing more flexibility in the event of an issue with your main system.
Conclusion
Building solid, reliable multi-pitch anchors on loose sandstone terrain requires careful planning, skillful gear placement, and a strong focus on redundancy. By carefully evaluating the rock, using modern protection techniques, and ensuring that all anchor points are properly tested and equalized, you can mitigate the risks of falling rocks or anchor failure. Whether you're climbing in a sandstone canyon or tackling a craggy desert route, these best practices will help you create safe and secure anchors for every pitch.
By remaining diligent, assessing risks, and using the right techniques, you'll not only be able to protect yourself on loose sandstone but also build the confidence necessary to tackle more challenging terrain.