My Golden Rules for Soaking, Washing Temp & Shrinkage Math That Never Let Me Down
There’s a certain magic in denim. The way it ages, fades, and tells a story is something that keeps me captivated as a denim artisan. However, the journey from raw denim to a well-worn pair of jeans is riddled with decisions, especially when it comes to soaking, washing temperatures, and shrinkage. Over my years of working with denim, I’ve developed personal rules that I swear by. These golden rules have helped me avoid some rookie mistakes, saving both my time and fabric. Let's examine the wisdom I’ve accumulated in my workshop!
The Importance of Soaking
Soaking is one of the first steps in breaking in raw denim. It allows the fibers to relax and prepares them for the washing process. Here's my approach:
- Temperature: I always soak in lukewarm water around 80°F (27°C). Hot water can cause excessive shrinkage and distort the fabric's original structure.
- Duration: I typically soak for about 30 minutes. This duration is long enough to allow for initial shrinkage without overdoing it.
- Detergents: I avoid any detergents during the first soak. Just plain water is sufficient at this stage.
After the soak, I always hang my denim to air dry. This reduces the risk of further shrinkage that can occur in the dryer.
Understanding Shrinkage
Shrinkage is one of those tricky aspects of denim care that every enthusiast must reckon with. Here’s my breakdown:
| Fabric Type | Pre-Shrunk (%) | Shrinkage After First Wash (%) | Final Measurements (inches) |
|---|---|---|---|
| Raw Denim | 0 | 3-5 | Waist: 32 → 30 |
| Selvedge Denim | 0 | 1-3 | Waist: 34 → 33 |
| Washed Denim | 10-15 | 0-1 | Waist: 36 → 36 |
When I first started sewing, I ignored the importance of shrinkage math, and it led to some disastrous fits. Now, I consciously factor in both the fabric type and how much I expect the denim to shrink. A simple rule to follow is that raw and selvedge denim typically shrinks by about 3-5% after the first wash, while washed denim is usually already pre-shrunk.
Washing Temperature Matters
Just like soaking, the temperature of your wash can make a significant difference in how your jeans hold up over time. Here’s how I approach it:
- Cold Wash (60°F / 15°C): I reserve this for my most delicate denim. It’s gentle, minimizes fading, and is great for maintaining the fabric's integrity.
- Warm Wash (80°F / 27°C): This is my go-to for denim that I want to clean thoroughly while still being cautious about shrinkage.
- Hot Wash (120°F / 49°C): I only use hot washes for heavily soiled denim or to achieve desired fading effects. Keep in mind, this can lead to more significant shrinkage, so I’m careful with this approach.
Washing your jeans too frequently can also lead to premature wear. I typically wash my favorite pairs every 5-6 wears unless they’re particularly dirty. In between washes, I recommend spot cleaning to keep them fresh.
Calculating Shrinkage
Let’s get into the math. To calculate shrinkage, I recommend the following formula:
Shrinkage (%) = (Original Size - New Size) / Original Size × 100
For example, if I have a pair of raw denim with a waist of 32 inches and it shrinks to 30 inches after the first wash, the calculation would be:
Shrinkage (%) = (32 - 30) / 32 × 100 = 6.25%
This is critical to know for future projects or purchases. Always have a tape measure handy and be prepared to take notes!
Final Thoughts
Over the years, I’ve learned that proper care of denim can be the difference between a beloved pair and a near-miss. By following these rules on soaking, washing temperatures, and shrinkage math, I’ve managed to maintain the integrity of my denim while achieving that sought-after fade. Don’t be afraid to experiment, but keep these golden rules in mind as your guiding stars with raw selvedge denim!