Plumbing a post on concrete ensures it stands perfectly vertical, which is crucial for structural integrity and aesthetics. This process typically involves securing the post to a concrete base or anchor while verifying its alignment.
The primary method for plumbing a post on concrete involves using temporary supports to hold it upright and vertical while securing it.
Steps for Plumbing a Post Using Braces
To plumb a post effectively before permanently fastening it to concrete, follow these steps:
- Position the Post: Place the post onto its intended position on the concrete footing or anchor point.
- Check for Vertical Alignment: Use a spirit level to plumb the post. Place the level against two adjacent sides of the post to check that it is perfectly vertical in both directions.
- Attach Temporary Braces: Before attaching the 2×4 braces, ensure the post is held as close to plumb as possible manually or with temporary support. Then, secure the 2x4 braces from the post down to the ground or another stable point to hold the post firmly in the plumb position you just verified with the spirit level.
- Secure the Post: Once the post is held plumb by the braces, it's time for the permanent connection. Afterwards, insert lag screws and nails into the post, through the anchors. Anchor types can vary (e.g., bolt-down post bases).
- Verify Plumbness During Fastening: It is essential to make sure the post is plumb when inserting the screws. Continuously check the post with your spirit level as you drive in the lag screws and nails to ensure it doesn't shift out of alignment.
Alternative Method Using Direct Anchors
Alternatively, you could attach the simpson anchor directly to the concrete slab first. In this method:
- The post base (like a Simpson anchor) is secured to the concrete using concrete fasteners (e.g., anchor bolts or wedge anchors).
- The post is then placed into the anchor.
- Use a spirit level to plumb the post within the anchor.
- Secure the post to the anchor using appropriate fasteners (like bolts, screws, or nails, as mentioned in the reference), ensuring the post is plumb when inserting the screws and other fasteners. Temporary bracing might still be helpful, especially for taller or heavier posts.
Key Tools & Materials
Here are the essential items you'll likely need:
| Tool/Material | Purpose |
|---|---|
| Spirit Level | To check and verify vertical alignment. |
| 2x4 Braces | To temporarily support and hold the post |
| Anchors | Connects post to concrete |
| Lag Screws | Secure post through anchors |
| Nails | Also used to secure post through anchors |
Properly plumbing a post is a fundamental step in construction, ensuring your structure is sound and looks professional.
